Related:

• 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...
• Diogenes lighted a candle in the daytime, and went round saying, "I am looking for a man.
  -- Diogenes Laertius (c. 200 AD) -- Diogenes, vi...
• When asked what learning was the most necessary, he said, "Not to unlearn what you have learned.
  -- Diogenes Laertius (c. 200 AD) -- Antisthenes, iv...
• Diogenes said once to a person who was showing him a dial, "It is a very useful thing to save a man from being too late for supper.
  -- Diogenes Laertius (c. 200 AD) -- Menedemus, iii...
• Asked from what country he came, he replied, "I am a citizen of the world.
  -- Diogenes Laertius (c. 200 AD) -- Diogenes, vi...
• When asked what wine he liked to drink, he replied, "That which belongs to another.
  -- Diogenes Laertius (c. 200 AD) -- Diogenes, vi...
• He was once asked what a friend is, and his answer was, "One soul abiding in two bodies.
  -- Diogenes Laertius (c. 200 AD) -- Aristotle, xi...
• 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...
• When a man reproached him for going into unclean places, he said, "The sun too penetrates into privies, but is not polluted by them.
  -- Diogenes Laertius (c. 200 AD) -- Diogenes, vi...