[...]conception is the method by which we discover things that are unknown, going on to further discoveries by means of what adjoins to and follows from our first perception with regard to the thing studied."

"[...]conception is the method by which we discover things that are unknown, going on to further discoveries by means of what adjoins to and follows from our first perception with regard to the thing studied. For when we have formed some idea of what we seek to know, by adapting what follows to the first result of our discoveries we gradually conduct our inquiry to the end of our proposed research. But why enumerate the greater and more splendid results of this faculty? For every one who is not unfriendly to truth can see for himself that all else that Time has discovered for the service and benefit of human life, has been discovered by no other instrumentality than that of conception." (ἐπίνοια, i.e. ἔφοδος εὑρετικὴ τῶν ἀγνοουμένων, διὰ τῶν προσεχῶν τε καὶ ἀκολούθων...τὸ ἐφέξῆς ἐξευρίσκουσα) (Answer to Eunomius' Second Book, NPNF, p. 268)