The interest of the behaviorist in man's doings is more than the interest of the spectator—he wants to control man's reactions as physical scientists want to control and manipulate other natural phenomena.

我能计算天体的运动，却无法计算人们的疯狂。

某人的一小步就是人类的一大步。

By plucking her petals you do not gather the beauty of the flower.