C. F. Keil and Franz Delitzsch on Proverbs 14:15

Pro 14:15 15 The simple believeth every word;      But the prudent takes heed to his step.

We do not translate, “every thing,” for “word” and faith are correlates, Psa 106:24, and פּתי is the non-self-dependent who lets himself be easily persuaded by the talk of another: he believes every word without proving it, whether it is well-meant, whether it is true, whether it is salutary and useful, so that he is thus, without having any firm principle, and without any judgment of his own, driven about hither and thither; the prudent, on the other hand, considers and marks his step, that he may not take a false step or go astray, he proves his way (8a), he takes no step without thought and consideration (בּין or הבין with ל, to consider or reflect upon anything, Psa 73:17, cf. Psa 33:15) - he makes sure steps with his feet (Heb 12:13), without permitting himself to waver and sway by every wind of doctrine (Eph 4:14).