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

But with regard to the material world, we can at least go so far as this;-we can perceive that events are brought about, not by insulated interpositions of Divine power, exerted in each particular ease, but by the establishment of general laws.

It is a test of true theories not only to account for but to predict phenomena.

Those who have obtained the farthest insight into Nature have been, in all ages, firm believers in God.

The system becomes more coherent as it is further extended. The elements which we require for explaining a new class of facts are already contained in our system. In false theories, the contrary is the case.

The catastrophist constructs theories, the uniformitarian demolishes them.

In art, truth is a means to an end; in science, it is the only end.