Albert Barnes Commentary Psalms 108:1

"My heart is fixed, O God; I will sing, yea, I will sing praises, even with my glory." — Psalms 108:1 (ASV)

O God, my heart is fixed - Prepared, suited, ready. See the notes at Psalms 57:7. In Psalms 57:7, this is repeated: My heart is fixed; O God, my heart is fixed: indicating that there might have been some doubt or vacillation caused by the circumstances existing then. The repetition would relate to that, as if the psalmist had been unsettled and wavering for a time, but was finally firm. In such circumstances, it would not be unnatural to repeat the assertion, as if there were no longer any doubt. In the beginning of a psalm, however, where there had been no previous expression or feeling of doubt, as far as it seems, there would be no propriety in repeating the assertion.

I will sing and give praise - See the notes at Psalms 57:7.

Even with my glory - This is not in Psalms 57:1-11. It is literally here, truly my glory. In Psalms 57:8, however, the expression, Awake up, my glory, occurs, and this seems to correspond with that language. It means here that it was his glory—his honor—to be employed in this way in giving praise to God. It was worthy of all that was elevated in his nature, of all that constituted his glory, of his highest powers. At no time is man employed in a more noble and lofty work than praise.