John Calvin Commentary Psalms 75:9

"But I will declare for ever, I will sing praises to the God of Jacob." — Psalms 75:9 (ASV)

and 10. But I will publish for ever. This conclusion of the psalm demonstrates the joy God’s people felt from experiencing Him as their deliverer in adversity. For it seems to be their own experience they commit to publishing, and because of which they resolve to sing praise to God. From this, they also gather that by divine aid they will overcome all the power of the reprobate, and that, possessing righteousness and justice themselves, they will be sufficiently armed for their own preservation and defense.

The expression, the horns of the righteous shall be exalted, implies that the children of God, by a blameless and holy life, acquire greater strength and more effectually protect themselves than if it were their effort to advance their own interests by every kind of wickedness.