Let us beware lest we in our pride accept the erroneous notion that idolatry consists only in kneeling before visible objects of adoration, and that civilized peoples are therefore free from it. The essence of idolatry is the entertainment of thoughts about God that are unworthy of Him. It begins in the mind and may be present where no overt act of worship has taken place
“When they knew God,” wrote Paul, “they glorified him not as God, neither were thankful; but became vain in their imaginations, and their foolish heart was darkened.”
Then followed the worship of idols fashioned after the likeness of men and birds and beasts and creeping things. But this series of degrading acts began in the mind. Wrong ideas about God are not only the fountain from which the polluted waters of idolatry flow; they are themselves idolatrous. The idolater simply imagines things about God and acts as if they were true.