Intuition is the source of scientific knowledge.
The true and the approximately true are apprehended by the same faculty; it may also be noted that men have a sufficient natural instinct for what is true, and usually do arrive at the truth. Hence the man who makes a good guess at truth is likely to make a good guess at probabilities.
Virtue, then, is twofold, intellectual and moral. Both the coming-into-[1103a] being and increase of intellectual virtue result mostly from teaching—hence it requires experience and time—whereas moral virtue is the result of habit, and so it is that moral virtue got its name [ēthikē] by a slight alteration of the term habit [ethos].