Optimists tend to interpret their troubles as transient, controllable, and specific to one situation. Pessimists, on the other hand, believe that their troubles last forever, undermine everything they do, and are uncontrollable.

The only way to do great work is to love what you do.

在计算学习理论中，挑战不仅仅是学习，而是理解学习是如何可能的。