Quotation:

 John Dewey quotes (American Philosopher, Psychologist and Educator, 1859-1952)

 Chinese Proverbs quotes

 Aristotle quotes (Ancient Greek Philosopher, Scientist and Physician, 384 BC-322 BC)

 Ignacio Estrada quotes

 Jean Piaget quotes (Swiss Psychologist and pioneer in the study of child intelligence, 1896-1980)

 Socrates quotes (Ancient Greek Philosopher, 470 BC-399 BC)

 Bertrand Russell quotes (English Logician and Philosopher 1872-1970)

 Kahlil Gibran quotes (Lebanese born American philosophical Essayist, Novelist and Poet. 1883-1931)

 William Butler Yeats quotes (Irish prose Writer, Dramatist and Poet. Nobel Prize for Literature in 1923. 1865-1939)

 Nelson Mandela quotes (South African Statesman First democratically elected State President of South Africa (1994), 1993 Nobel Prize for Peace, b.1918)

 Robert M. Hutchins quotes (American Educator and Writer, active in forming the Committee to Frame a World Constitution (1945), led the Commission on Freedom of the Press (1946), and vigorously defended academic freedom, opposing faculty loyalty oaths in the 1950s. 1899-1977)