翻译：既了解敌人，又了解自己，每次作战都不会有危险。

There's no art To find the mind's construction in the face; He was a gentleman on whom I built An absolute trust.

Sometimes the simplest things are the most powerful.

Act as if what you do makes a difference. It does.

You can't control how other people feel, but you can control how you react to them.