How sharper than a serpent's tooth is to have a thankless child.

无论代价如何，安全必须始终放在第一位。

The power of abstraction is that it allows us to reason about systems at a higher level, without getting bogged down in the details.

Keeping an active mind has been vital to my survival, as has been maintaining a sense of humor.

One’s attitude to oneself is the single most important factor in living a long and reasonably happy life.

史记