All things are possible until they are proved impossible and even the impossible may only be so, as of now.

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.

数学是给不同事物以相同名称的艺术。