The LORD [is] my strength and my shield; my heart trusted in him, and I am helped: therefore my heart greatly rejoiceth; and with my song will I praise him.
Ver. 7. The Lord is my strength and my shield] So that I am furnished and harnessed within and without. See Psalms 18:2 .
My heart trusted in him, and I am helped] Faith substantiateth things not yet seen, Hebrews 11:1, it altereth the tenses, saith one, and putteth the future into the present tense, as here.
My heart greatly rejoiceth, &c.] Inwardly I am glad, warmed at heart; and outwardly cheerful, even unto singing. And what will David sing? See his ditty in the next words.