忧虑是人们生存的重要条件。与忧虑的正面交锋可以为我们驱赶厌倦感，使我们的感觉更加敏锐，并且保持人类生存所必须的压力。

Love does not begin and end the way we seem to think it does. Love is a battle, love is a war; love is a growing up.

Only he who desires is amiable and not he who is satiated.

现在如果送给别人很少的东西，却希望人家回报很多的东西，那么，人们就会怕你再送东西给自己了。