We must be free not because we claim freedom, but because we practice it.

The art of life is to live in the present moment, and to make that moment as perfect as we can.

The human soul is a dark vast forest, with wild life in it.

The world is full of noise, but it is in silence that we find ourselves.

I don't believe in pessimism. If something doesn't come up the way you want, forge ahead. If you think it's going to rain, it will.

What do we call visible light? We call it color. But the colors are only the names we give to the way light behaves when it hits something.

不要盯着时钟，做它该做的事，继续前进。