Psalms 103:18

Farther, as nothing is more easy than for hypocrites to flatter themselves under a false pretext, that they are in favor with God, or for degenerate children groundlessly to apply to themselves the promises made to their fathers, it is again stated, by way of exception, in the 18th verse, that God is merciful only to those who, on their part, keep his covenant, which the unbelieving make of none effect by their wickedness. The keeping, or observing of the covenant, which is here put instead of the fear of God, mentioned in the preceding verse, is worthy of notice; for thus David intimates that none are the true worshippers of God but those who reverently obey his Word. Very far from this are the Papists, who, thinking themselves equal to the angels in holiness, nevertheless shake off the yoke of God, like wild beasts, by trampling under foot his Holy Word. David, therefore, rightly judges of men’s godliness, by their submitting themselves to the Word of God, and following the rule which he has prescribed to them. As the covenant begins with a solemn article containing the promise of grace, faith and prayer are required, above all things, to the proper keeping of it. Nor is the additional clause superfluous — who remember his statutes; for, although God is continually putting us in mind of them, yet we soon slide away to worldly cares — are confused by a multiplicity of avocations, and are lulled asleep by many allurements. Thus forgetfulness extinguishes the light of truth, unless the faithful stir up themselves from time to time. David tells us that this remembrance of God’s statutes has an invigorating effect when men employ themselves in doing them. Many are sufficiently forward to discourse upon them with their tongues whose feet are very slow, and whose hands are well nigh dead, in regard to active service.