Don’t let fear stop you from taking the first step.

The human mind is so complex and things are so tangled up with each other that, to explain a blade of grass, one would have to make a diagram of the universe.

物理学的美在于它能够用简单而优雅的理论解释复杂的事物。

关于幸福，你只有在失去它的时候才知道你曾经拥有过。

The chief prevention against getting old is to remain astonished.

A liberdade é um bem que não tem preço.

文学的美在于它让我们在一生中活出一千种人生。