Repeated reflection and inquiry have led me to the somewhat novel opinion, that value depends entirely upon utility.

Science arises from the discovery of Identity amid Diversity.

The whole value of science consists in the power which it confers upon us of applying to one object the knowledge acquired from like objects; and it is only so far, therefore, as we can discover and register resemblances that we can turn our observations to account.

It is clear that economics, if it is to be a science at all, must be a mathematical science.

As a general rule, it is foolish to do just what other people are doing, because there are almost sure to be too many people doing the same thing.

You will perceive that economy, scientifically speaking, is a very contracted science; it is in fact a sort of vague mathematics which calculates the causes and effects of man's industry, and shows how it may be best applied.

The wind, as a direct motive power, is wholly inapplicable to a system of machine labour, for during a calm season the whole business of the country would be thrown out of gear. Before the era of steam-engines, windmills were tried for draining mines; but though they were powerful machines, they were very irregular, so that in a long tract of calm weather the mines were drowned, and all the workmen thrown idle.