To such as keep his covenant, and to those that remember his commandments to do them.
Ver. 18. To such as keep his covenant] For else they shall know God's breach of promise, as it is Numbers 14:3,4. Neither shall it benefit them to have been born of godly parents.
To those that remember his commandments] That resolve to do them, though in many things they fail, Qui faciunt praecepta etiamsi non perficiant, that wish well to that which they can never compass, Psalms 119:4,5. If they cannot open the door, yet if they give a pluck at the bolt or a lift of the latch, there is comfort.