We choose our joys and sorrows long before we experience them.
Kahlil Gibran

Wear your learning, like your watch, in a private pocket, and do not pull it out and strike it merely to show you have one. If you are asked what o'clock it is, tell it, but do not proclaim it hourly and unasked, like the watchman.
Lord Chesterfield

The most incomprehensible thing about the world is that it is at all comprehensible.
Albert Einstein