Scientists, animated by the purpose of proving they are purposeless, constitute an interesting subject for study. - Alfred North Whitehead

Philosophers can never hope finally to formulate these metaphysical first principles. Weakness of insight and deficiencies of language stand in the way inexorably. Words and phrases must be stretched towards a generality foreign to their ordinary usage; and however such elements of language be stabilized as technicalities, they remain metaphors mutely appealing for an imaginative leap.

The mountain endures. But when after ages it has worn away, it has gone. If a replica arises, it is yet a new mountain.

A colour is eternal. It haunts time like a spirit. It comes and it goes. But where it comes, it is the same colour. It neither survives nor does it live.

The greatest invention of the nineteenth century was the invention of the method of invention.