John Gill Commentary Psalms 115:15

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

You are blessed of the Lord
The Arabic version reads it, "we are blessed"; with temporal and with spiritual blessings; being the beloved of the Lord, chosen of him; whose sins are pardoned, whose persons are justified by the righteousness of Christ; who are put among the children of God, and are heirs of God, and joint heirs with Christ; regenerated by his Spirit, favoured with communion with God, and wrought up to some degree of conformity to Christ, and shall ever be with him.

Which made heaven and earth ;
and so able to bless with all kind of blessings, both heavenly and earthly; and from whom all help and assistance may be hoped for, and who may be trusted and confided in: and this, it may be, is observed to distinguish him from the idols of the Gentiles, who made not the heavens and the earth; and who are not able to bless, nor give the least relief to any of their votaries.