数学的本质在于它的自由。

对所有生物的爱是人类最高尚的品质。

The greatest glory in living lies not in never falling, but in rising every time we fall.

All mankind... being all equal and independent, no one ought to harm another in his life, health, liberty, or possessions.

人不仅是自然的存在，也是历史的存在。