“They followed the heathen in their worship of idolatrous gods. He said, "and they became vain," that is, they became idolaters. They not only became idolaters, they became perverse and depraved and devoid of truth, just like the heathen that were around them. So obviously in this passage the word "vanity" refers not only to idolatry, but it refers to perverseness and depravity as well.”

— Pastor John Weaver