The deepest principle in human nature is the craving to be appreciated.

在野外，没有第二次机会。你必须第一次就做对。

The tears of the world are a constant quantity. For each one who begins to weep, somewhere else another stops. The same is true of the laugh.

If you're lucky enough to be different, don't ever change.

The value of a mental process lies in its utility for the organism's adjustment to life.

Two possibilities exist: either we are alone in the Universe or we are not. Both are equally terrifying.