Hence the existence of a class of substances which are undecomposable and therefore seem simple, appears to be an implication; and the corollary is that these were formed during early stages of terrestrial concentration, under conditions of heat and pressure which we cannot now parallel.
"Essays: Scientific, Political, & Speculative, Vol. I"
Herbert Spencer
Just as our concept of space, which is apt to be thought a simple, undecomposable concept, is yet resolvable into experiences quite different from that state of consciousness which we call space; so, probably, the sentiment of affection or reverence is compounded of elements that are severally distinct from the whole which they make up.
"Essays: Scientific, Political, & Speculative, Vol. I"
Herbert Spencer
We have to deal with will not as a single undecomposable faculty unaffected by bodily conditions, but as a result of organic changes in the supreme centres, affected as certainly and as seriously by disorders of them as our motor faculties are by disorders of their centres.
"Determinism or Free-Will?"
Chapman Cohen