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• When asked what learning was the most necessary, he said, "Not to unlearn what you have learned.
  -- Diogenes Laertius (c. 200 AD) -- Antisthenes, iv...
• Bury me on my face," said Diogenes; and when he was asked why, he replied, "Because in a little while everything will be turned upside down.
  -- Diogenes Laertius (c. 200 AD) -- Diogenes, vi...
• When Zeno was asked what a friend was, he replied, "Another I.
  -- Diogenes Laertius (c. 200 AD) -- Zeno, xix...
• When asked what wine he liked to drink, he replied, "That which belongs to another.
  -- Diogenes Laertius (c. 200 AD) -- Diogenes, vi...
• Thales said there was no difference between life and death.
  Why, then," said some one to him, "do not you die?...
• When he was praised by some wicked men, he said, "I am sadly afraid that I must have done some wicked thing.
  -- Diogenes Laertius (c. 200 AD) -- Antisthenes, iv...
• When Thales was asked what was difficult, he said, "To know one's self.
  And what was easy, "To advise another." -- Diogenes Laertius (c. 200 AD) -- Thales, ix...
• When asked what he would take to let a man give him a blow on the head, he said, "A helmet.
  -- Diogenes Laertius (c. 200 AD) -- Diogenes, vi...
• Being asked whether it was better to marry or not, he replied, "Whichever you do, you will repent it.
  -- Diogenes Laertius (c. 200 AD) -- Socrates, xvi...