(A note on John of St. Thomas. Curs. Phil 1. p. 200)
Knowledge is from sense and so from induction. Either the term of the induction can be reached by a single instance, or many are required. But just as many is indefinite the sufficiency of the manifestation is indefinite. The first sort of induction is the most common kind, used in metaphysics, mathematics, logic, grammar, etc.
(Note – this does not remove the need to pick the best instance that suffices. If one proved Euclid’s interior angle proof with a right triangle, and the right triangle as the opposite angle, we could easily think that the proof rested on the equality of right angles.)
But the study of nature, as a rule, involves the second kind of induction, and so as a rule the term of the induction is always indefinite. New refuting evidence is always a possibility. Though this is true as a rule, it is not true without exception. That motion is continuous, or that a principle is ordered to a term, or that motion actualizes some potential are not the sort of inductions that become more manifested by multiplication of experiences. Any particular instance of experience suffices to manifest them, which is to say that the sort of multiplication that is required is not of the same sort as the multiplication that, say, moves experience from “a theory” to “a law”.