Society can and does execute its own mandates， and if it issues wrong mandates instead of right， or any mandates at all in things with which it ought not to meddle， it practices a social tyranny more formidable than many kinds of political oppression， since， though not usually upheld by such extreme penalties， it leaves fewer means of escape， penetrating much more deeply into the details of life， and enslaving the soul itself.

"In computational learning theory, the challenge is not just to learn, but to understand how learning is possible."

挑战是伪装的机遇。水产养殖中的每个问题都推动我们寻找更聪明的解决方案。

不要小看孩子，他们比我们想象的要聪明得多。

修炼的四个阶段：将精转化为气，气转化为神，神回归虚无，最终与道合一。