Charles H. Spurgeon on Psalms 18:38

The destruction of our spiritual enemies is complete. We may exult over sin, death, and hell, as disarmed and disabled for us by our conquering Lord; may he graciously give them a like defeat within us.

Verses 39 and 40. It is impossible to be too frequent in the duty of ascribing all our victories to the God of our salvation. It is true that we have to wrestle with our spiritual antagonists, but the triumph is far more the Lord's than ours. We must not boast like the ambitious votaries of vainglory, but we may exult as the willing and believing instruments in the Lord's hand of accomplishing his great designs.