John Calvin Commentary Psalms 71:14

"But I will hope continually, And will praise thee yet more and more." — Psalms 71:14 (ASV)

But I will hope continually. David again, as having obtained the victory, prepares himself for thanksgiving. There is, however, no doubt that during the time when the wicked derided his simplicity, he struggled courageously in his distresses, as can be gathered from the word hope. Although, to outward appearance, there was no prospect of deliverance from his troubles, and although the wicked did not cease proudly to pour contempt upon his trust in God, he nevertheless determined to persevere in the exercise of hope; even as it is a genuine proof of faith to look exclusively to the Divine promise, in order to be guided by its light alone in the thickest darkness of afflictions.

The strength, then, of the hope of which David speaks, is to be estimated by the conflicts which he at that time sustained. In saying, I will add to all thy praises, he shows the confidence with which he anticipated a desirable escape from his troubles. It is as if he had said — Lord, I have long been accustomed to receive benefits from you, and this fresh addition to them, I have no doubt, will give me new reason for celebrating your grace.