对文明社会中的任何成员进行强制性权力行使的唯一正当目的，是防止对他人造成伤害。
The only purpose for which power can be rightfully exercised over any member of a civilized community， against his will， is to prevent harm to others.
生活的艺术在于懂得何时坚持，何时放手。
The universe would look to a two-dimensional creature who spend its life moving on the service of what turned out to be a globe， it could travel for millions of years and would always return to its starting point， it would never be conscious of what was above it or beneath it.
Let us try to teach generosity and altruism, because we are born selfish.
行义事不能进行时，不要责怪道义。
But it is the same with man as with the tree. The more he seeks to rise into the height and light, the more vigorously do his roots struggle earthword, downword, into the dark, the deep - into evil.
Train people well enough so they can leave, treat them well enough so they don't want to.
The truth is always stranger than fiction.
The past is a shadow that follows us, but it is up to us to decide whether it will darken our future.