To see what is general in what is particular, and what is permanent in what is transitory, is the aim of scientific thought.

The motive of success is not enough.

Human life is driven forward by its dim apprehension of notions too general for its existing language.

Our reasonings grasp at straws for premises and float on gossamers for deductions.

Civilization advances by extending the number of important operations which we can perform without thinking of them.

People make the mistake of talking about 'natural laws.' There are no natural laws. There are only temporary habits of nature.

Religion is what the individual does with his own solitariness.