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Socrates in Wikipedia
An unexamined life is not worth living.
The only true wisdom is in knowing you know nothing.
Nature has given us two ears, two eyes, and but one tongue-to the end that we should hear and see more than we speak.
I cannot teach anybody anything, I can only make them think.
Wisdom begins in wonder.
It can be hard to teach them in half an hour, but we can give them a few pointers and encouragement when they stop. Most people don't believe they can juggle, but they can.
The older guys, I knew all their faces. Some of our younger guys, I had to do a double take.
Don't let what you cannot do interfere with what you can do.