Psalms 119:35

He had before prayed to God to enlighten his understanding, that he might know his duty, and not mistake concerning it; here he prays to God to bow his will, and quicken the active powers of his soul, that he might do his duty; for it is God that works in us both to will and to do, as well as to understand, what is good, Phi 2:13. Both the good head and the good heart are from the good grace of God, and both are necessary to every good work. Observe here, I. The grace he prays for. 1. That God would make him able to do his duty: "Make me to go; strengthen me for every good work." Since we are not sufficient of ourselves, our dependence must be upon the grace of God, for from him all our sufficiency is. God puts his Spirit within us, and so causes us to walk in his statutes (Eze 36:27), and this is that which David here begs. 2. That God would make him willing to do it, and would, by his grace, subdue the aversion he naturally had to it: "Incline my heart to thy testimonies, to those things which thy testimonies prescribe; not only make me willing to do my duty, as that which I must do and therefore am concerned to make the best of, but make me desirous to do my duty as that which is agreeable to the new nature and really advantageous to me.

— Matthew Henry's Concise Commentary (public domain)