Internal mental events are irrelevant to the scientific study of behavior.

译文：识破人情冷暖，就会吓坏我们，看穿世间的事情，我们的内心就会寒心。赏析：世间的一切事就如人饮水，冷暖自知。人情淡薄，世态炎凉是人之常情，我们不可过多地为此伤透脑筋。放一颗平常心，过好自己的人生就行。

There is no reason why good cannot triumph as often as evil. The triumph of anything is a matter of organization.

解析：好善恶恶是人之本能。

The language of mathematics is universal; it transcends all cultural barriers.

Doubt is not a pleasant condition， but certainty is an absurd one.