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The value or worth of a man is, as of all other things, his price; that is to say, so much as would be given for the use of his power.

"The only way to learn mathematics is to do mathematics."

光是所有存在的起源。

譯文：志向正直就能遏制各種壞念頭，心里平靜處理各種事情就不會急躁。賞析：惡念是所有錯誤行為的根源，我們要砥礪自己的品格，遇事沖動魯莽，只會壞事。

采礦業的未來在于可持續性和技術。