Robert A. Heinlein quotes (American science-fiction Writer, 1907-1988)
Henry David Thoreau quotes (American Essayist, Poet and Philosopher, 1817-1862)
Beverly Sills quotes ( . b.1929)
Aristotle quotes (Ancient Greek Philosopher, Scientist and Physician, 384 BC-322 BC)
Albert Einstein quotes (German born American Physicist who developed the special and general theories of relativity. Nobel Prize for Physics in 1921. 1879-1955)