An evildoer listens to wicked lips, and a liar gives ear to a mischievous tongue.
Proverbs 17:4 ESV

You can tell a lot about a person by whom he hears. Does he listen to astrologers, prosperity gospel teachers, or Hollywood directors? Don't listen to him or trust him. Does he listen to thoughtful expositors, knowledgeable teachers, or accomplished scholars? Then he might be worth listening to as well.