A history of philosophy in its most famous quotes. Today: Ancient Greek philosopher Socrates saying: “I know only one thing: that I know nothing.” If you like reading about philosophy, here's a free, weekly newsletter with articles just like this one: Send it to me! “ I know only one thing: that I know nothing. (Attributed to Socrates, Apology ) ” Socrates (470–399 BC) was an ancient Greek philosopher, often cited as one of the “fathers” of philosophy, especially of a particular method of philos