This book deals with western philosophy - its concepts and applications to our world. The basic ideas of philosophy are discussed from the ancient Greeks and Romans like Plato, Aristotle, and Epictetus to philosophers of the Middle Ages, like St. Augustine and Thomas Aquinas. In the 17th and 18th centuries, ethics is analyzed by Spinoza and Kant. God's existence and causality are seen through the eyes of Pascal, Berkeley, and Russell. Existentialism, with its emphasis on one's subjective experience, is discussed by Kierkegaard and Sartre. In the 20th century, philosophers stressed language and the meaning of statements. Key issues such as economic justice, good vs evil, the certainty of knowledge and the meaning of life are examined.