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.

可持续性是现代商业的基石，没有它，我们就像在沙地上建房。

我宁愿选择自由伴随着危险，也不要安宁却伴随着奴役。