Heraclitus (; Greek: Ἡράκλειτος Herákleitos; fl. c. 500 BC) was an ancient Greek pre-Socratic philosopher from the city of Ephesus, which was then part of the Persian Empire.
It is better to hide ignorance, but it is hard to do this when we relax over wine.
Whoso neglects learning in his youth,
Loses the past and is dead for the future.
Learning without thought is labor lost; thought without learning is perilous.