当我看着这个世界时，我是悲观的，但当我看着人们时，我是乐观的。

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.

An individual has not started living until he can rise above the narrow confines of his individualistic concerns to the broader concerns of all humanity.

宇宙充满了奥秘，这正是让科学家保持动力的原因。