唯一真正的智慧是知道你一无所知。

We must remember that this is a very small star and probably some of the larger and the more important stars and may be very virtual and happy.

Sustainability is no longer an option; it's a necessity for survival.

A clear mission gives direction and purpose to every action.

有时候最难的事情和最正确的事情是同一件事。

The art of the past is being mystified because a privileged minority is striving to invent a history which can retrospectively justify the role of the ruling class.