Socrates is an enigmatic figure, known chiefly through the accounts of others like Plato and Aristophanes. He was one of the most brilliant intellects ever, and devised what would later be called the Socratic method, which is a way of leading one's interlocutor to see his errors and contradictions through clever questioning before leading him to the truth. In ancient Athens, Socrates was widely known as a "gadfly", that is, an annoying insect buzzing at people's ears, because he kept questioning prejudices and contradictions; he was eventually tried and executed for "corrupting the minds of the youth".

The philosophy of Confucius was so powerful that it dominated intellectual life in ancient China for centuries. It even came to be considered a religion, and there are still temples where Confucius is worshipped as the God of Culture. His writings were transmitted as aphorisms, each one of them one concentrated teaching about philosophy, ethics, or society.

Lao Tsu, also known as Lao Tzu or Laozi, is an ancient Chinese philosopher and sage, and an absolutely central figure in Asiatic culture. He is known as the author of the "Tao Te Ching" or "Daodejing" and the founder of Taoism. In traditional China, Taoism is a way of living in harmony with the Tao, "way", "path", or "principle", something that is both the source of, and the force behind, everything that exists. Throughout history, Laozi's work has been embraced by various anti-authoritarian movements, because his style is designed to elicit critical thinking through ambiguousness.

The great figures of modern philosophy led generations to struggle with the most crucial of questions and break through a new understanding of conscience and existence. Nietzsche's work is radical, sometimes violent, often ironic; it fascinates anyone bold enough to delve into it, exerted a profound influence on modern intellectual history, and covers a wide range of subjects. Immanuel Kant is one of the most important figures of German philosophy, said to have affected a Copernican revolution in philosophy.

Pupil of the great Plato, teacher of Alexander the Great, Aristotle is a massively influential figure in Western philosophy. Cicero described his literary style as "a river of gold". Modern ethics are based on his ideas about virtue; his writings literally encompassed all the scientific knowledge of the time and beyond, so much that many of his findings were still considered cutting-edge many century afterwards. Aristotle also shaped modern logic, and put his mark on all subsequent philosophy and theology.

Marcus Aurelius was a Roman Emperor, the last of the Five Good Emperors, and one of the most important Stoic philosophers, along with the slave Epictetus. Marcus Aurelius wrote the Meditations while in a military campaign; it was a series of notes written for no one but himself in his quest for self-improvement. Stoicism is the attitude allowing one to free oneself from the unnecessary suffering that arises from anxiety about events that are beyond our control; therefore, it can be of tremendous importance in one's life.

Alfred North Whitehead once noted: "the safest general characterization of the European philosophical tradition is that it consists of a series of footnotes to Plato." Plato is indeed considered the most pivotal figure in the development of philosophy, along with his teacher, Socrates, and his student, Aristotle. But his writings are often light, fresh and funny; it was Plato who invented the dialogue in philosophy, which makes a point very easy to follow and the occasion of various scenic arrangements.

One of the undisputed giants in the history of human thought, and the founder of one of the world's longest-lasting cultural traditions, Confucius (known as Kong Fuzi in his native China) is arguably the most enduring of all the world's great thinkers. The Analects, the slender volume thought to have been compiled by his followers, has the strongest claim to represent Confucius' actual words. The book contains memorable sayings about the moral health of the individual, the family and the body politic.

Gautama Buddha is also known as Siddharta Gautama, or simply the Buddha, which means "Awakened" or "Enlightened". Born a prince, he chose a path of ascetism only to realize that it was as profound an illusion as self-indulgence. He achieved Enlightenment after 49 days of meditation; his awakening led him to discover the cause of suffering and the ways to eliminate it. These discoveries founded Buddhism, and his "Four Noble Truths" still form the heart of its teachings.

Albert Einstein is widely considered as one of the greatest minds that ever lived. He developed the theory of relativity, one of the two pillars of modern physics alongside quantum mechanics, and penned the world's most famous equation, E=mc².

Xabier K. Fernao is a firm believer that quotations are one of the most beautiful and wisest thing to be ever created. Think about it. You can read a whole chunky and thick book. In search of knowledge, you'll be more likely bombarded with a barrage of confusion. Everyone is telling you what to think and how to think. The beauty of these quotations is that they give you the space for exploration.

Voltaire was a French writer famous for his wit and irony. They were his tools for launching vitriolic attacks on the established Catholic church, the adversaries of freedom of religion and expression, and on separation of church and state. His prolific writing took almost every possible literary form: plays, novels, essays, but also poems, historical and scientific works.

Jung regarded the unconscious and its symbolic content as crucial to our psychological development; among the central concepts of analytical psychology is individuation, which is the lifelong psychological process of differentiation of the self. Jung considered it to be the main task looming over every human being in their development, and experimented with a variety of practices to dive always deeper into it. These 100 quotes have been carefully selected to introduce you to his character and his way of thinking, and to inspire you into making your own discoveries about the unconscious.

In his lifetime, Ralph Waldo Emerson was the most widely known man of letters in America, establishing himself as a prolific poet, essayist, popular lecturer, and advocate of social reforms. He was considered one of the great orators of the time, and his enthusiasm and respect for his audience enraptured crowds. As a poet and philosopher, he led the Transcendentalist movement, which professes the belief that everything in ouf world is a microcosm of the universe, and in the infinitude of individual man.

Why have history's greatest minds - from George Washington to Frederick the Great to Ralph Waldo Emerson along with today's top performers, from Super Bowl-winning football coaches to CEOs and celebrities - embraced the wisdom of the ancient Stoics? Because they realize that the most valuable wisdom is timeless and that philosophy is for living a better life, not a classroom exercise. The Daily Stoic offers a daily devotional of Stoic insights and exercises, featuring all-new translations.