5. But I trust in thy goodness; my heart shall exult in thy salvation. I will sing unto the Lord, because he hath dealt bountifully with me.1
The Psalmist does not as yet feel how much he has profited by praying; but depending upon the hope of deliverance, which the faithful promise of God enabled him to entertain, he makes use of this hope as a shield to repel those temptations with the terror of which he might be greatly distressed. Although, therefore, he is severely afflicted, and a multiplicity of cares urge him to despair, he, notwithstanding, declares it to be his resolution to continue firm in his reliance upon the grace of God, and in the hope of salvation. With the very same confidence ought all the godly to be furnished and sustained, that they may duly persevere in prayer. Whence, also, we gather what I have formerly adverted to, that it is by faith we apprehend the grace of God, which is hidden from and unknown to the understanding of the flesh. As the verbs which the Psalmist uses are not put in the same tense, different meanings may be drawn from the different tenses; but David, I have no doubt, here wishes to testify that he continued firm in the hope of the deliverance promised to him, and would continue so even to the end, however heavy the burden of temptations which might press upon him. Accordingly, the word exult is put in the future tense, to denote the continued exercise of the affection spoken of, and that no affliction shall ever shake out of his heart the joy of faith. It is to be observed, that he places the goodness of God first in order, as being the cause of his deliverance, --
1 The Septuagint here add another line, namely
2 "Qui ne nous est point encore presente." -- Fr.