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Courtesy costs nothing. Lower the toilet seat after use. Let the people in the elevator exit before you enter. Return shopping carts to their designated areas. When you borrow something， return it better shape (filled up， cleaned) than when you got it.

The price of greatness is responsibility.

Sustainable quarrying means listening to the land as intently as we listen to shareholders.

A quarry should heal the earth even as it harvests from it.

Law is a system of rules, a union of primary rules of obligation and secondary rules of recognition, change, and adjudication.

我們越是了解非人類動物的真實本性，尤其是那些擁有復雜大腦和相應復雜社會行為的動物，就越會對它們在為人類服務中的使用產生倫理上的擔憂——無論是在娛樂、作為“寵物”、用于食物、在實驗室中，還是我們施加給它們的任何其他用途。