It is the mark of an educated man to look for precision in each class of things just so far as the nature of… — Aristotle

It is the mark of an educated man to look for precision in each class of things just so far as the nature of the subject admits; it is evidently equally foolish to accept probable reasoning from a mathematician and to demand from a rhetorician scientific proofs.

Source: Wikiquote · CC BY-SA 4.0