Psalms 27:1

We may observe here, I. With what a lively faith David triumphs in God, glories in his holy name, and in the interest he had in him. 1. The Lord is my light. David's subjects called him the light of Israel, Sa2 21:17. And he was indeed a burning and a shining light: but he owns that he shone, as the moon does, with a borrows light; what light God darted upon him reflected upon them: The Lord is my light. God is a light to his people, to show them the way when they are in doubt, to comfort and rejoice their hearts when they are in sorrow. It is in his light that they now walk on in their way, and in his light they hope to see light for ever. 2. "He is my salvation, in whom I am safe and by whom I shall be saved." 3. "He is the strength of my life, not only the protector of my exposed life, who keeps me from being slain, but the strength of my frail weak life, who keeps me from fainting, sinking, and dying away." God, who is a believer's light, is the strength of his life, not only by whom, but in whom, he lives and moves. In God therefore let us strengthen ourselves. II. With what an undaunted courage he triumphs over his enemies; no fortitude like that of faith.

— Matthew Henry's Concise Commentary (public domain)