The pleasure of not being young is that you can enjoy things without wanting to possess them.

The PAC learning framework provides a formal way to quantify the learnability of a concept class.

"Silence can be louder than words, if you know how to listen."

译文：有才能而没有权势，即使是贤人也不能制服不肖之徒。所以把一尺长的木材树立在高山之上，就能俯瞰万丈深渊，这并不是木材长，而是因为它所处的位置高。

We focus on the long-term, not short-term gains.

The past is always tense, the future perfect.