The Lord hath been mindful - He has never yet wholly abandoned us to our enemies.

He will bless the house of Israel - He will bless the people as a nation; he will bless the priesthood and Levites; he will bless all of them who fear him, great and small, in whatsoever station or circumstances found. There is a great deal of emphasis in this verse: several words are redoubled to make the subject the more affecting. I give a literal translation: -

Psalm 115:12 "The Lord has been mindful of us he will bless the house of Israel; she will bless the house of Aaron.

Psalm 115:13 He will bless them that fear Jehovah, the small with the great.

Psalm 115:14 Jehovah will add upon you, upon you and upon all your children.

Psalm 115:15 Blessed are ye of the Lord, the Maker of heaven and earth.

Psalm 115:16 The heavens of heavens are the Lord's: but the earth he hath given to the sons of Adam."

Jehovah is absolute Master of the universe. He has made the heavens of heavens, and also the earth; and this he gives to the children of Adam. When he exiled him from paradise, he turned him out into the earth, and gave it to him and his sons for ever, that they might dress, till, and eat of its produce all their days.

he will bless

Psalm 29:11 The LORD will give strength to his people; the LORD will bless his people with peace.

Psalm 112:1 Praise you the LORD. Blessed is the man that fears the LORD, that delights greatly in his commandments.

Psalm 128:1,4,5 Blessed is every one that fears the LORD; that walks in his ways...

Malachi 3:16,17 Then they that feared the LORD spoke often one to another: and the LORD listened, and heard it...

Malachi 4:2 But to you that fear my name shall the Sun of righteousness arise with healing in his wings; and you shall go forth...

Luke 1:50 And his mercy is on them that fear him from generation to generation.

Acts 13:26 Men and brothers, children of the stock of Abraham, and whoever among you fears God, to you is the word of this salvation sent.

Colossians 3:11 Where there is neither Greek nor Jew, circumcision nor uncircumcision, Barbarian, Scythian, bond nor free: but Christ is all...

both small

Acts 26:22 Having therefore obtained help of God, I continue to this day, witnessing both to small and great...

Revelation 11:18 And the nations were angry, and your wrath is come, and the time of the dead, that they should be judged...

Revelation 19:5 And a voice came out of the throne, saying, Praise our God, all you his servants, and you that fear him, both small and great.

Revelation 20:12 And I saw the dead, small and great, stand before God; and the books were opened: and another book was opened...

and. Heb. with

Impiety of Attributing a visible Form to God. --The Setting up of Idols a Defection from the True God.
1. God is opposed to idols, that all may know he is the only fit witness to himself. He expressly forbids any attempt to represent him by a bodily shape. 2. Reasons for this prohibition from Moses, Isaiah, and Paul. The complaint of a heathen. It should put the worshipers of idols to shame. 3. Consideration of an objection taken from various passages in Moses. The Cherubim and Seraphim show that images are not fit to represent divine mysteries. The Cherubim belonged to the tutelage of the Law. 4. …
John Calvin—The Institutes of the Christian Religion