Abraham Maslow quotes (American Philosopher and Psychologist, 1908-1970)
Lao Tzu quotes (Chinese taoist Philosopher, founder of Taoism, wrote "Tao Te Ching" (also "The Book of the Way"). 600 BC-531 BC)
Plato quotes (Ancient Greek Philosopher He was the world's most influential philosopher. 428 BC-348 BC)
Carl Gustav Jung quotes (Swiss psychiatrist, Psychologist and Founder of the Analytic Psychology, 1875-1961)
Leonardo da Vinci quotes (Italian draftsman, Painter, Sculptor, Architect and Engineer whose genius epitomized the Renaissance humanist ideal. 1452-1519)
