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I am not an Athenian or a Greek，but a citizen of the world.
Life is measured by thought and action，not by time.
It is not shame for a man to learn that which he knows not，whatever his age.
The secret of change is to focus all of your energy，not on fighting the old，but on building the new.
We are here to add what we can you to life，not to get what we can from it.
Life is painting a picture，not doing a sum.
The secret of happiness，you see，is not found in seeking more，but in developing the capacity to enjoy less.
The world is the totality of facts, not of things.