Verse 1. - My heart is fixed. In the original form (Psalm 57:7) this emphatic phrase was reiterated, which much increased the force of the declaration. I will sing and give praise, even with my glory. It is difficult to assign any distinct meaning to the last clause, which has nothing parallel to it in Psalm 57:7.
108:1-13 We may usefully select passages from different psalms, as here, Ps 57; 60, to help our devotions, and enliven our gratitude. When the heart is firm in faith and love, the tongue, being employed in grateful praises, is our glory. Every gift of the Lord honours and profits the possessor, as it is employed in God's service and to his glory. Believers may pray with assured faith and hope, for all the blessings of salvation; which are secured to them by the faithful promise and covenant of God. Then let them expect from him help in every trouble, and victory in every conflict. Whatever we do, whatever we gain, God must have all the glory. Lord, visit all our souls with this salvation, with this favour which thou bearest to thy chosen people.
Even with my glory; my tongue; in Psalm 57:8, it is read, "awake up my glory". See Gill on Psalm 57:7,