7. and 8. They break forth into singing. Here he shows how greatly tyrants are hated by the whole world. When they are dead or ruined, all men break forth into joy, and express the feelings which they formerly entertained towards the tyrants, and which they dissembled through fear. Then do their hatred and spite burst forth, and not only do men make known their joy, but even the dumb creatures, as the Prophet, for the sake of amplification, adds the fir-trees and the cedars. As tyranny overturns everything, so when tyranny is done away, everything appears to be restored to its original condition.
Since thou art laid down, no feller is come up against us. To make the discourse more energetic, he adds a personification, in which he introduces the trees as speaking and congratulating themselves that, since the tyrant is dead, they will now stand gladly and at ease. The design of the Prophet is to show, that the Heavenly Judge cannot endure tyrants, who are abhorred by the whole world. Hence, we ought to conclude that, though under the sway of tyrants unhappy men are silent, and do not venture to open their mouths, yet the Lord listens to their secret groans. Let us not wonder therefore that tyrants come to such a dismal end; for God, who is a witness of the injuries which they have inflicted, must in the exercise of his justice assist the innocent.