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.
"Books are the quietest and most constant of friends; they are the most accessible and wisest of counselors, and the most patient of teachers."
真正的冒险家毫无目的、不计后果地去迎接未知的命运。
反馈是鲁棒控制的关键。
Risk management in mining isn't about eliminating all risks - that's impossible - but about understanding and mitigating them intelligently.