The best way to predict the future is to study the past.

每一次挫折都是为了卷土重来。

The growing good of the world is partly dependent on unhistoric acts; and that things are not so ill with you and me as they might have been, is half owing to the number who lived faithfully a hidden life, and rest in unvisited tombs. ― George Eliot, Middlemarch

生下来就知道的人是上等，经过学习才知道的人是次一等，遇到困惑才学习的人是又次一等，有了困惑而不学习的，这是最下等的人。