Matthew Poole and continuators on Proverbs 14:15

15 The simple believeth every word , but the prudent man looketh well to his going .

Either the harmless Man: or rather a foolish Man, because he is opposed to the prudent.

Is easily deceived with the smooth words and fair pretences of false and deceitful men.

Either 1. to his own going, as this is generally understood, he ordereth his conversation and dealings in the World with due circumspection, not considering so much what other men say as what he ought to do. Or, 2. to the going of the deceiver, whose the word in the former clause is suppos'd to be. So the sense is, he judgeth of mens words and professions by their conversations; which is a good rule.