Charles H. Spurgeon on Psalms 19:13

"Keep back thy servant also from all presumptuous sins." He doth desire absolutely to be kept from "presumptuous sins;" but then, he adds by way of supposition and reserve, that if he could not by reason of his naughty heart be kept from them, yet that they might not have full power and dominion over him. —Thomas Manton.

Verse 13. "Keep back thy servant." It is an evil man's cross to be restrained, and a good man's joy to be kept back from sin. When sin puts forth itself, the evil man is putting forth his hand to the sin; but when sin puts forth itself, the good man is putting forth his hand to heaven; if he finds his heart yielding, out he cries, O keep back thy servant. An evil man is kept back from sin, as a friend from a friend, as a lover from his lover, with knit affections and projects of meeting; but a good man is kept back from sin, as a man from his deadly enemy, whose presence he hates, and with desires of his ruin and destruction. It is the good man's misery that he hath yet a heart to be more tamed and mastered; it is an evil man's vexation and discontent, that still, or at any time, he is held in by cord or bridle. And thus you see what David aims at in desiring to be kept back from presumptuous sins, namely, not a mere suspension, but a mortification, not a not acting only, but a subduing of the inclination; not for a time, but for ever. —Obadiah Sedgwick.