Here forms, here colours, here the character of every part of the universe are concentrated to a point; and that point is so marvellous a thing ... Oh! marvellous, O stupendous Necessity - by thy laws thou dost compel every effect to be the direct result of its cause, by the shortest path. These are miracles.

Necessity is the theme and the inventress, the eternal curb and law of nature.

Necessity is the mistress and guide of nature.

Nature never breaks her own laws.

There is no result in nature without a cause; understand the cause and you will have no need of the experiment.

Human subtlety will never devise an invention more beautiful, more simple or more direct than does nature because in her inventions nothing is lacking, and nothing is superfluous.