Our ideas must agree with realities, be such realities concrete or abstract

Pessimism leads to weakness. Optimism leads to power.

No one sees further into a generalization than his own knowledge of detail extends.

Man lives for science as well as bread.

The most natively interesting object to a man is his own personal self and its fortunes. We accordingly see that the moment a thing becomes connected with the fortunes of the self, it forthwith becomes an interesting thing.

We must make automatic and habitual, as early as possible, as many useful actions as we can, and as carefully guard against the growing into ways that are likely to be disadvantageous.

We are all ready to be savage in some cause. The difference between a good man and a bad one is the choice of the cause.