There is a mask of theory over the whole face of nature.

The person who did most to give to analysis the generality and symmetry which are now its pride, was also the person who made mechanics analytical; I mean Euler.

Every man has obligations which belong to his station. Duties extend beyond obligations, and direct the affections, desires, and intentions, as well as the actions.

Conscience is the reason employed about questions of right and wrong.

Hence no force, however great, can stretch a cord, however fine, into a horizontal line which is accurately straight: there will always be a bending downwards.

We need very much a name to describe a cultivator of science in general. I should incline to call him a scientist. [The first use of the word.]

The catastrophist constructs theories, the uniformitarian demolishes them.