The sun is our most powerful tool in Africa. We must learn to work with it, not against it.

勇气并不在于无所畏惧地冒险，而在于坚决为正义事业而决心前行。

When someone makes a decision, he is really diving into a strong current that will carry him to places he had never dreamed of when he first made the decision.

心理过程的价值在于它对有机体适应生活的效用。

成功的关键在于坚持和努力。