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• Once when Bion was at sea in the company of some wicked men, he fell into the hands of pirate
  and when the rest said, "We are undone if we are known,"--"But I," said he, "am undone if we are not known....
• When asked what learning was the most necessary, he said, "Not to unlearn what you have learned.
  -- Diogenes Laertius (c. 200 AD) -- Antisthenes, iv...
• Asked from what country he came, he replied, "I am a citizen of the world.
  -- 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...
• Very late in life, when he was studying geometry, some one said to Lacydes, "Is it then a time for you to be learning now?
  If it is not," he replied, "when will it be?" -- Diogenes Laertius (c. 200 AD) -- Lacydes, v...
• Antisthenes used to say that envious people were devoured by their own disposition, just as iron is by rust.
  -- Diogenes Laertius (c. 200 AD) -- Antisthenes, iv...
• Be of good cheer," said Diogenes; "I see land." -- 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?...
• 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...