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He who is not a good servant will not be a good master.
People can be divided into these types: strangers, acquaintances, familiar people, friends, and close friends. True friendship isn't about compliments to your face, but whether you're mentioned when they talk about friends behind your back.
"The only thing that is real is the present moment."
The true power of mathematics is not in its complexity, but in its simplicity and elegance.