John Gill Commentary Psalms 33:16

"There is no king saved by the multitude of a host: A mighty man is not delivered by great strength." — Psalms 33:16 (ASV)

There is no king saved by the multitude of an host
He may be at the head of a numerous army, and yet not get the victory over a lesser one, nor escape safe, but be taken by it: there have been such instances; and if he is saved, or gets the victory, it is not owing to the multitude with him, but to the Lord, that gives salvation to kings, (Psalms 144:10) . Hence it appears that even such men need salvation themselves, and cannot save themselves, though they have ever so many at command, and therefore are not to be trusted in; salvation is only of the Lord;

a mighty man is not delivered by much strength ;
as Goliath, with his great strength, could not deliver himself out of the hands of David, a stripling; wherefore the mighty man should not glory in his might.