Psalms 115:14,15 - Joseph Benson’s Commentary on the Old and New Testaments

The Lord shall increase you more and more In number, power, and in all temporal and spiritual blessings, notwithstanding the efforts of your many enemies to diminish, weaken, and distress you. Hebrew, יס Š עליכם, the Lord shall add to you, namely, further and greater blessings. Here the psalmist turns himself to them, and assures them of the favour of him who created, and who upholds and governs all things. You and your children The blessing bestowed on you shall descend on your children with a continual increase. There is a blessing entailed on the offspring of them that fear God, even in their infancy. Or, he shall bless you in your children, and you shall have the comfort of seeing them increasing, as in stature, so in wisdom and grace, and in favour with God and men. Ye are blessed of the Lord You and your children are so; all that see them shall acknowledge that they are the seed which the Lord hath blessed, Isaiah 61:9. Ye are blessed of the Lord Not of an impotent idol which can do its worshippers neither good nor hurt, but of Jehovah, who made heaven and earth Whose blessings therefore are free, for he needs not any thing himself; and therefore are rich, for he hath all things at command for you, and if you fear and trust in him he will bless you indeed, in spite of all that your enemies can do against you.