Charles H. Spurgeon on Psalms 144:10

It is he that giveth salvation unto kings. Those whom the Lord sets up he will keep up. Kings, from their conspicuous position, are exposed to special danger, and when their lives and their thrones are preserved to them they should give the Lord the glory of it. In his many battles David would have perished had not almighty care preserved him. He had by his valour wrought salvation for Israel, but he lays his laurels at the feet of his Lord and Preserver. If any men need salvation kings do, and if they get it the fact is so astonishing that it deserves a verse to itself in the psalm of praise. Who delivereth David his servant from the hurtful sword. He traces his escape from death to the delivering hand of God. Note, he speaks in the present tense —delivereth, for this was an act which covered his whole life. He puts his name to the confession of his indebtedness: it is David who owns without demur to mercy given to himself. He styles himself the Lord's servant, accepting this as the highest title he had attained or desired.