Perhaps as important is the relation between the existence of solutions to a competitive equilibrium and the problems of normative or welfare economics.

他思想的勇气与言语的坦率相配。

Acting is a way to explore the human condition.

我认为只要你用心去做，一切皆有可能。

Change will not come if we wait for some other person or some other time. We are the ones we've been waiting for. We are the change that we seek.

如果你还在想着昨天，你就不会有更好的明天。