Heraclitus of Ephesus quotes (Greek philosopher remembered for his cosmology, 540-480BC)
Norman Vincent Peale quotes (American Protestant Clergyman and Writer, 1898-1993)
African Proverb quotes
Spanish Proverb quotes
Winston Churchill quotes (British Orator, Author and Prime Minister during World War II. 1874-1965)
Reinhold Niebuhr quotes (American theologian, 1892-1971)
Peter M. Senge quotes
Mahatma Gandhi quotes (Indian Philosopher, internationally esteemed for his doctrine of nonviolent protest, 1869-1948)
Charles Darwin quotes (English Naturalist and Author of the theory of evolution by natural selection. 1809-1882)
Henry David Thoreau quotes (American Essayist, Poet and Philosopher, 1817-1862)
