John Calvin Commentary Psalms 115:15

"Blessed are ye of Jehovah, Who made heaven and earth." — Psalms 115:15 (ASV)

You are blessed of Jehovah. In the preceding verse, the prophet had given them the hope of uninterrupted happiness. This hope arises from God’s infinite resources never failing (however liberally and largely He bestows His gifts) and from His never ceasing to enrich those whom He has admitted as sharers of His bounty.

In confirmation of this doctrine, he declares that the children of Abraham were separated from other nations. Therefore, relying upon this privilege, they might unhesitatingly and unreservedly surrender themselves to a Father so gracious and bountiful.

And because the flesh, in its dullness, cannot perceive the power of God (although understanding this power is what preserves us in a state of peace and security under His protection), the prophet, by designating Him the maker of heaven and earth, reminds us that there is no reason to fear His inability to defend us.

For, having created the heaven and the earth, He does not now remain unconcerned in heaven; rather, all creation is under His sovereign control.