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

良好设计的关键是使事情简单，但不过于简单。

The tears of the world are a constant quantity. For each one who begins to weep, somewhere else another stops. The same is true of the laugh.

The more you speak, the more likely you are to say something foolish.

The only merit I have is to have painted directly from nature.

Leadership is about making others better as a result of your presence and making sure that impact lasts in your absence.