Albert Barnes' Notes on the Whole Bible - Psalms 108:4
For thy mercy ... - This is taken from Psalms 57:10. The only change is in the expression “above the heavens,” instead of “unto the heavens.” The sense is essentially the same. The particular idea here, if it differs at all from the expression in Psalms 57:1-11, is, that the mercy of God seems to “descend” from heaven upon man, or “comes down” from on high. read more
Albert Barnes' Notes on the Whole Bible - Psalms 108:3
I will praise thee, O Lord ... - This is taken from Psalms 57:9. The only change is the substitution here of the name יהוה Yahweh for אדני 'Adonāy. Why that change was made is unknown. read more