Psalms 19:13

"Keep back thy servant also from presumptuous sins;

Let them not have dominion over me:

Then shall I be upright,

And I shall be clear from great transgression."

Presumptuous sins are the same as willful sins, against which there is a stem warning indeed in Hebrews 10:26-31. Willful sins derive their temptation from thoughts that, "Maybe God will not care, just this once," or that, "Oh, we are under grace and not under law," or some other self-deception. The Lord says, "We are under law to Christ" (1 Corinthians 9:21).

"And I shall be clear from (the) great transgression." There is no article in the Hebrew; but evidently some unusually significant transgression is meant. Maclaren explained this as, "A designation for casting off the very pretense of worshipping Jehovah."[12]