Loneliness is the starting point of thought.
A miner's skill and dedication are just as valuable as the coal they bring to the surface.
可持续性不是一种选择;它是我们对后代的责任。
勇气是所有美德中最重要的,因为没有勇气,你就无法始终如一地实践其他美德。
The most important thing in science is not to stop questioning.