I think goals should never be easy, they should force you to work, even if they are uncomfortable at the time.

任何工厂中最危险的化学品不是罐子里的那些，而是自满情绪。

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.

Do not put forward anything that you cannot prove by experimentation.