New Defender's Study Bible Notes
28:15 perfect in thy ways. This being was of incomparable beauty and wisdom (Ezekiel 28:17), “perfect in all his ways,” causing his heart to be “lifted up” to attempt to displace His own Creator (see Isaiah 14:12-15).
28:15 iniquity. When iniquity was found in this perfect being—evidently the sin of rebellion against God—he who had been Lucifer (“Light-Bearer”) became Satan (“The Adversary”), and has remained God’s greatest foe ever since.