A Guide to the Thinkers Who Shaped Human Thought
Debbie’s Introduction: Why This Series Exists
For as long as humans have existed, we have asked questions. Not small questions, but the big ones — the questions that keep people awake at night, the questions that show up during difficult times, and the questions that quietly appear when life is calm and we finally have a moment to think.
Questions like:
- Why am I here?
- What is the meaning of life?
- Why do people suffer?
- What is the soul?
- Is there a God?
- How should I live?
- What happens after death?
- What is truth?
These questions are not new. In fact, they are ancient. Long before modern technology, long before the internet, and long before the world became as busy and noisy as it is today, there were men and women who dedicated their lives to thinking about these questions. Some were philosophers. Some were spiritual teachers. Some were mystics. Some were theologians. Some were simply people who paid very close attention to life and tried to understand it.
The deep questions of life are not always contemplated or discussed, but the answers we accept as truth can have an impact on our approach to life in general. You may find your truth is not with the teachings of a single philosopher; instead, you may find a piece of truth in the teachings of several or all of the teachers presented in this series. Each of them offer a unique perspective, a slightly different way to explore the deep questions of life.
This series, Influential Philosophers & Spiritual Teachers, is an exploration of those people — the thinkers who shaped the way humans understand life, truth, God, the mind, the soul, and what it means to be human.
This is not a strictly academic series, and it is not tied to any one religion or belief system. Instead, this series is meant to be a guide — a way to explore the ideas of some of the most influential thinkers in history in a way that is thoughtful, approachable, and relevant to modern life.
Reading about various philosophers and their perspectives is a great way to gain new insights, insights that may reaffirm what you already hold to be true, as well as some that may lead to deeper explorations. It might result in a deeper understanding of yourself as well as the views of others.
Some of the people we will explore were religious. Some were not. Some believed strongly in God. Some believed in a universal mind or a cosmic order. Some focused on reason and logic. Others focused on inner experience and spiritual awakening. But all of them, in their own way, were trying to answer the same fundamental question:
What does it mean to live a good, meaningful, and truthful life?
What Is Philosophical Spirituality?
When many people hear the word philosophy, they think of complicated books, difficult ideas, or abstract theories that don’t seem connected to everyday life. When people hear the word spirituality, they often think of religion, meditation, prayer, or personal growth.
But for much of human history, philosophy and spirituality were not separate things.
Many ancient philosophers were not just asking:
“What is the world made of?”
They were also asking:
“How should we live?”
“What is the soul?”
“How do we become better human beings?”
“How do we find peace?”
“How do we live in harmony with the universe?”
In this sense, philosophical spirituality can be understood as the pursuit of:
- Self-knowledge
- Truth
- Wisdom
- Inner transformation
- Understanding reality
- Living a meaningful life
It is different from dogmatic religion because it is not based only on rules or traditions. It is different from pure academic philosophy because it is not just about theories — it is about how to live.
Many of the philosophers and spiritual teachers in this series were deeply concerned with the same thing you and I are concerned with today:
How do we live in a world that can be beautiful, confusing, joyful, and painful all at the same time?
Why Philosophers Still Matter Today
It might be tempting to think that people who lived 2,000 years ago could not possibly understand modern life. After all, they did not have smartphones, cars, social media, or modern science. Their world was very different from ours in many ways.
And yet, in the most important ways, their world was exactly the same.
They experienced:
- Love
- Loss
- Fear
- Hope
- Illness
- Death
- War
- Peace
- Friendship
- Betrayal
- Success
- Failure
- Uncertainty about the future
- Questions about God
- Questions about the soul
- Questions about why life can be so hard sometimes
Technology has changed, but human nature has not changed nearly as much as we think.
That is why these philosophers still matter. They were trying to understand:
- The human mind
- Human behavior
- Suffering
- Happiness
- Meaning
- Ethics
- Society
- The divine
- The universe
And those are still the same things we are trying to understand today.
When you read the words of some of these thinkers, you may be surprised to find that something written 2,000 years ago feels like it could have been written yesterday. That is because they were not writing about trends or technology — they were writing about the human condition.
Ancient Foundations: The Soul, The Mind, and The Cosmos
Some of the earliest influential philosophers in the Western world, such as Socrates, Plato, and Aristotle, were deeply concerned with questions about the soul, knowledge, ethics, and the nature of reality.
Socrates, for example, believed that the most important thing a person could do was examine their own life. He is famous for the idea that “the unexamined life is not worth living.” For Socrates, self-knowledge was the foundation of wisdom.
Plato, a student of Socrates, wrote about the idea that the physical world we see is not the ultimate reality. He believed there was a higher, more perfect reality — a world of eternal truths and forms — and that the soul is connected to this higher reality.
Aristotle, a student of Plato, focused more on practical life. He wrote about ethics, logic, politics, and what it means for a human being to flourish. He believed that happiness comes from living a balanced life guided by reason and virtue.
Around the same time, in other parts of the world, great teachers in Eastern traditions were also exploring similar questions.
In China, Confucius taught about ethics, relationships, and how to create a harmonious society through moral behavior and respect for others.
Lao Tzu, associated with Taoism, taught about living in harmony with the Tao — the natural flow of the universe — and emphasized simplicity, humility, and non-force.
In India and Nepal, the Buddha taught about suffering, the causes of suffering, and a path toward inner peace and enlightenment.
Even though these teachers lived in different parts of the world and in different cultures, many of them were asking the same questions and arriving at surprisingly similar insights:
- Know yourself
- Live ethically
- Let go of unnecessary desire
- Seek truth
- Live in harmony with something greater than yourself
The Mystics and Theologians: The Search for God
As history moved forward, many philosophers began to focus more directly on God, theology, and the relationship between human beings and the divine.
Thinkers such as Saint Augustine wrote about the inner life of the soul and the idea that the search for God is also a search within oneself. Augustine believed that truth and God could be found through deep introspection and spiritual reflection.
Thomas Aquinas later tried to reconcile faith and reason, arguing that rational thought and religious belief did not have to be in conflict — that both could lead to truth.
During this time, many mystics wrote about direct experiences of the divine — experiences of unity, love, and connection with something greater than the individual self. These writings often sound very similar to mystical writings from other religions and traditions around the world, which has led many scholars to believe that there may be a common core to mystical experience across cultures.
The Turning Inward: Modern Philosophy and the Self
As the world entered the modern era, philosophy began to turn inward even more. Thinkers started focusing on the individual, the mind, and personal experience.
Baruch Spinoza wrote about God and nature as being one and the same — a radical idea at the time — and described a kind of spiritual understanding that comes through reason and deep understanding of reality.
Søren Kierkegaard focused on the individual’s relationship with God, faith, anxiety, and what it means to truly exist as a human being who must make choices without absolute certainty.
In more recent times, Carl Jung explored the human psyche, the unconscious mind, archetypes, and the idea that spiritual symbols and religious experiences are deeply connected to the structure of the human mind itself.
These thinkers helped shift the conversation from:
“What is the universe?”
to also include
“What is happening inside the human mind and soul?”
The Perennial Philosophy: Is There a Universal Truth?
In the 20th century, some thinkers began to study religions and philosophies from all over the world and noticed that many of them seemed to share similar ideas at their core.
They noticed recurring themes such as:
- The idea of a higher reality
- The idea that the ego is not the true self
- The importance of compassion
- The importance of self-knowledge
- The idea that humans can experience a kind of awakening or enlightenment
- The belief that love, truth, and wisdom are central to a meaningful life
This idea — that there may be a perennial philosophy, or a universal truth that appears in different forms across different cultures — is a fascinating topic and one that connects many of the thinkers we will explore in this series.
Existentialism and the Modern Human Experience
In more modern philosophy, especially after times of great war and social change, some philosophers began focusing on what it means to live in a world that can feel uncertain, chaotic, or even meaningless at times.
Existentialist thinkers explored ideas such as:
- Freedom
- Responsibility
- Anxiety
- Meaning
- Choice
- Authenticity
They asked questions like:
- If life has no obvious meaning, do we create our own meaning?
- What does it mean to live authentically?
- How do we face suffering and death?
These are not easy questions, but they are very human questions, and they are still being asked today.
How to Use This Series
This series is not meant to be read like a textbook, and you do not need to read it in order.
Think of this series more like a map.
Each philosopher or spiritual teacher we will explore represents a different path, a different perspective, or a different attempt to answer life’s biggest questions.
Some focused on:
- Logic and reason
- Ethics and how to live
- God and theology
- The soul
- The mind
- Society
- Suffering
- Enlightenment
- Nature and the universe
You may find that you are drawn to some thinkers more than others, and that is perfectly normal. Different ideas resonate with different people at different times in their lives.
If you are searching for meaning, you might be drawn to existentialist thinkers.
If you are interested in inner peace, you might be drawn to Stoicism or Buddhism.
If you are interested in God and theology, you might be drawn to Augustine or Aquinas.
If you are interested in the mind and psychology, you might be drawn to Carl Jung.
If you are interested in living in harmony with life, you might be drawn to Lao Tzu or Confucius.
There is no single “correct” place to start. The goal of this series is not to tell you what to believe, but to introduce you to some of the greatest thinkers in history so that you can explore their ideas and decide for yourself what resonates, what makes sense, and what helps you live a more thoughtful and meaningful life.
Influential Philosophers & Spiritual Teachers
Below is the list of philosophers and spiritual teachers included in this series. As each article is published, the names below will become links so you can easily explore each thinker and their ideas.
- Alan Watts
- Aristotle
- Augustine
- Buddha
- Carl Jung
- Confucius
- Epictetus
- Fredrich Nietzche
- Henry David Thoreau
- Immanuel Kant
- Joseph Campbell
- Kierkegaard
- Lao Tzu
- Marcus Aurelius
- Meister Eckhart
- Plato
- Plotinus
- Ralph Waldo Emerson
- Rumi
- Seneca
- Simone Weil
- Socrates
- Spinoza
- Thomas Aquinas
- Viktor Frankl
(This series will continue to grow over time as more philosophers and spiritual teachers are added.)
Merlin’s Closing Thoughts
Across thousands of years of human history, empires have risen and fallen, technology has transformed the world, and societies have changed in countless ways. And yet, the fundamental questions of human existence have remained remarkably consistent.
Who are we?
Why are we here?
What is true?
What is good?
How should we live?
The philosophers and spiritual teachers in this series did not all agree with each other. In fact, many of them would strongly disagree with one another. But that is part of what makes philosophy so valuable. Philosophy is not just about finding answers — it is about learning how to think, how to question, how to reflect, and how to live more consciously.
If there is one thing these thinkers seem to agree on, across time and across cultures, it is this:
A meaningful life does not happen by accident.
It happens when a person begins to ask questions, seek truth, and live with intention.
This series is an invitation to meet some of the men and women who dedicated their lives to that search — and, perhaps, to continue the search in your own way.