The greatest obstacle to being heroic is the doubt whether one may not be going to prove one's self a fool; the truest heroism is to resist the doubt; and the profoundest wisdom, to know when it ought to be resisted, and when to be obeyed.

对不起妈妈，我从没想过要伤害你。我从没想过让你哭泣，但今晚我要清理我的衣橱。

The idea of a multiverse is a natural consequence of inflation, suggesting that our universe might be just one of many.

A quota is just a number unless it’s enforced with conviction.