The most beautiful thing in mathematics is the simplicity of the ideas behind the complexity.

All the choir of heaven and furniture of earth - in a word， all those bodies which compose the frame of the world - have not any subsistence without a mind.

Sustainable development requires balancing economic benefits with environmental protection.

Without imperfection, you or I would not exist.

法律与道德的分离是法律体系存在的必要条件。