John Gill Commentary Psalms 66:18

"If I regard iniquity in my heart, The Lord will not hear:" — Psalms 66:18 (ASV)

If I regard iniquity in my heart
There was iniquity in his heart, as there is in every good man's heart, and a great deal too; it is full of it; and it should be regarded in some sense, so as to guard against it, and pray to be kept from it, that it may not break forth into action; and so as to loath it, abhor it, and be humbled for it; but not so as to nourish and cherish it, to take delight and pleasure in it.

or "if I look upon it" ^F8 , as it may be rendered; that is, with approbation of it, and satisfaction in it, and ordered his conversation according to it; or acted the deceitful and hypocritical part in prayer; or had any evil intention in his petitions, to consume on his lusts what he asked for;

the Lord will not hear [me] ;
for the Lord hears not sinners that delight in sin, and live in it; neither profane sinners nor hypocrites; see (John 9:31) (Job 27:8Job 27:9) .

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FOOTNOTES:

• F8: (ytyar Ma) "si vidi", Pagninus, Montanus; "si aspexi", V. L. "si conspexi", Gejerus.