Date: 420 BC

It does, but not for you. Truth is not in you--for your ears, your mind, your eyes are blind!

— Sophocles (495 BC - 405 BC)

Date: 380-360 B.C.

"[T]here is in every soul an organ or instrument of knowledge that is purified and kindled afresh by such studies when it has been destroyed and blinded by our ordinary pursuits, a faculty whose preservation outweighs ten thousand eyes, for by it only is reality beheld."

— Plato (427 BC - 347 BC)