Albert Barnes Commentary Psalms 18:3

"I will call upon Jehovah, who is worthy to be praised: So shall I be saved from mine enemies." — Psalms 18:3 (ASV)

I will call upon the Lord - The idea here is that he would constantly call upon the Lord. In all times of trouble and danger he would go to Him and invoke His aid. The experience of the past had been such as to lead him to put confidence in Him in all time to come. He had learned to flee to Him in danger, and he had never put his trust in Him in vain. The idea is that a proper view of God’s dealings with us in the past should lead us to feel that we may put confidence in Him in the future.

Who is worthy to be praised - More literally, “Him who is to be praised I will call upon, Jehovah.” The prominent—the leading thought—is that God is a being in every way worthy of praise.

So shall I be saved from my enemies - Ever onward, and at all times. He had had such ample experience of His protection that he could confide in Him as one who would deliver him from all his foes.