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.

Thoreau's classic account of the solitary life, describing his attempts to simplify his life and sort out his priorities by living alone in a cabin beside Walden Pond for nearly two years, is one of the most influential books ever written. The bible of the environmental movement, Walden vividly portrays Thoreau's reverence for nature, and his understanding of the idea that nature is made up of crucially interrelated parts.

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.

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.

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".

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.

After sixty years of keeping notes on the things he's seen and learned and on the golfing greats he's taught, Penick lets the secrets in his Little Red Book be heard by the golf world in this classic work. His simple, direct, practical wisdom pares away all the hypertechnical jargon that's grown up around the game, and lets all golfers play their best - whatever their level.

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.

The ancient Toltecs believed that life, as we perceive it, is a dream. We each live in our own personal dream, and these come together to form the dream of the planet, or the world in which we live. Problems arise when our perception of the dream becomes clouded with negativity, drama, and judgment (of ourselves and others), because it's in these moments of suffering that we have forgotten that we are the architects of our own reality and we have the power to change our dream if we choose.

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.