语言是心灵的声音，而沉默是它的回响。

Mathematics is not just about numbers, equations, computations, or algorithms: it is about understanding.

The heart of the educator must be a living flame, a source of warmth and light.

The best technology is invisible—it just works.

如果可能的话，和平；无论如何，真理。

很可能未来会发明出更多辅助视觉的工具，它们超越现有仪器的程度，就像现有仪器超越肉眼一样。