The coexistence, therefore, of Primeval Causes, ranks, to us, among merely casual concurrences: and all those sequences or coexistences among the effects of several such causes, which, though invariable while those causes coexist, would, if the coexistence terminated, terminate along with it, we do not class as cases of causation, or laws of nature: we can only calculate on finding these sequences or coexistences where we know by direct evidence, that the natural agents on the properties of which they ultimately depend, are distributed in the requisite manner.
"A System Of Logic, Ratiocinative And Inductive (Vol. 1 of 2)"
John Stuart Mill
He had a light, easy way of touching on things, as if all his concessions, conclusions, and concurrences were merest matter of course; and thus making himself appear master of the situation over which he merely skimmed on insect-wing.
"Weighed and Wanting"
George MacDonald
The mixtures of constitutional proclivities made more or less unlike by unlikenesses of physical conditions, inevitably led to occasional concurrences of forces producing deviations of structure.
"Essays: Scientific, Political, & Speculative, Vol. I"
Herbert Spencer