乐观主义者倾向于将他们的麻烦解释为暂时的、可控的和特定于一种情况的。另一方面，悲观主义者认为他们的麻烦会永远存在，破坏他们所做的一切，并且无法控制。

Earth provides enough to satisfy every man's needs， but not every man's greed.

The essence of mathematics is not to make simple things complicated, but to make complicated things simple.

我们所谓的"新媒体"终将变成简单的"媒体"。

But man is not made for defeat. A man can be destroyed but not defeated.

I do not know what I may appear to the world， but to myself I seem to have been only like a boy playing on the sea-shore， and diverting myself in now and then finding a smoother pebble or a prettier shell than ordinary， whilst the great ocean of truth lay all undiscovered before me.

I don’t like to be labeled. I like to be free.