在言语之间的沉默中，我们常常发现最深刻的真理。

Courtesy costs nothing. Lower the toilet seat after use. Let the people in the elevator exit before you enter. Return shopping carts to their designated areas. When you borrow something， return it better shape (filled up， cleaned) than when you got it.

If you can see, look. If you can look, observe.

In mathematics, the art of proposing a question must be held of higher value than solving it.

Waste is just a resource we haven't learned to value yet.

The true work of art is but a shadow of the divine perfection.