Happiness is an attitude. If you are used to being unhappy, even in the best of situations you will still grumble and be unhappy. Nothing can make you happy in the world.

幸福是一种态度。如果你习惯于不快乐，那么即使在最好的境遇中，你依然会抱怨、依然不快乐。世间没有任何事物能让你幸福。