创作的过程比结果更重要。

The mathematician does not study pure mathematics because it is useful; he studies it because he delights in it and he delights in it because it is beautiful.

The question is not whether the thing exists， but whether it has any essence which is capable of existence without us.

改变始于决定，但靠行动维持。

质量不是一种行为，而是一种习惯。