Commentaries:
Jamieson, Fausset, and Brown
If I regard iniquity in my heart—literally, "see iniquity with pleasure."
With these he unites his public thanks, inviting those who fear God (Psalms 60:4; Psalms 61:5, His true worshippers) to hear. He vindicates his sincerity, inasmuch as God would not hear hypocrites, but had heard him.
Other Jamieson, Fausset, and Brown entries containing Psalms 66:18:
2 Kings 13:1-3
Job 27:9
Proverbs 28:9
Isaiah 1:15
Isaiah 58:9
Ezekiel 14:3
Ezekiel 20:3
Daniel 9:13
Amos 5:24
Jonah 3:8
1 John 3:22
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