形式验证的挑战在于弥合抽象模型与实际实现之间的差距。

There are no vital and significant forms of art; there is only art, and precious little of that.

That is what learning is. You suddenly understand something you've understood all your life, but in a new way.

A clear vision turns obstacles into stepping stones.

记忆可以使一件事看起来比实际更多。