哲学是一门苦行僧的学科。
数学的艺术在于发现包含所有普遍性萌芽的特殊案例。
The state of nature has a law of nature to govern it, which obliges every one: and reason, which is that law, teaches all mankind, who will but consult it, that... no one ought to harm another in his life, health, liberty, or possessions.