Psalms 144:6

When men become eminent for things as to which they have had few advantages, they should be more deeply sensible that God has been their Teacher. Happy those to whom the Lord gives that noblest victory, conquest and dominion over their own spirits. A prayer for further mercy is fitly begun with a thanksgiving for former mercy. There was a special power of God, inclining the people of Israel to be subject to David; it was typical of the bringing souls into subjection to the Lord Jesus. Man's days have little substance, considering how many thoughts and cares of a never-dying soul are employed about a poor dying body. Man's life is as a shadow that passes away. In their highest earthly exaltation, believers will recollect how mean, sinful, and vile they are in themselves; thus they will be preserved from self-importance and presumption. God's time to help his people is, when they are sinking, and all other helps fail.

Cast forth lightning, and scatter them. The Eternal can hurl his lightnings wheresoever he pleases, and effect his purpose instantaneously. The artillery of heaven soon puts the enemy to flight: a single bolt sets the armies running hither and thither in utter rout. Shoot out thine arrows, and destroy them. Jehovah never misses the mark; his arrows are fatal to his foes when he goes forth to war. It was no common faith which led the poet king to expect the Lord to use his thunderbolts on behalf of a single member of that race which he had just now described as "like to vanity." A believer in God may without presumption expect the Almighty Lord to use on his behalf all the stores of his wisdom and power: even the terrible forces of tempest shall be marshalled to the fight, for the defence of the Lord's chosen. When we have once mastered the greater difficulty of the Lord's taking any interest in us, it is but a small thing that we should expect him to exert his great power on our behalf. This is far from being the only time in which this believing warrior had thus prayed: Ps 18:1-50 is specially like the present; the good man was not abashed at his former boldness, but here repeats himself without fear.