Cleanse me from secret faults

Who can know their own heart but God.  The heart is evil above all things (Jer 17:9). God knows the things we do when no one is around.

“Who can understand his errors? Cleanse me from secret faults.” Psalm 19:12

If you are struggling with sins you cannot shake, a besetting sin, “But put on the Lord Jesus Christ, and make no provision for the flesh, to fulfill its lusts.” Romans 13:14

“Keep back Your servant also from presumptuous sins;
Let them not have dominion over me. Then I shall be blameless,
And I shall be innocent of great transgression.” Psalm 19:13