Thou art my God, and I will praise thee - This is the language of the author of the psalm - his solemn profession before the sanctuary and the altar; his response to the priesthood. In Psalms 118:27, they had declared that “Jehovah alone was God;” to this he now replies, that he acknowledges, it; he recognizes him as the true God, and as his God; he comes to praise him; and he professes his purpose always to exalt him as his God.
Thou art my God, I will exalt thee - Repeating the solemn declaration that Yahweh alone was the God whom he worshipped, and that it was his purpose always to magnify his name.