Proverbs 14:15 in the World English Bible
A simple man believes everything, but the prudent man carefully considers his ways.
Context
14 The backslider in heart shall be filled with his own ways: and a good man shall be satisfied from himself.
15 The simple believeth every word: but the prudent man looketh well to his going.
16 A wise man feareth, and departeth from evil: but the fool rageth, and is confident.