Albert Barnes 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 — I will always cherish hope; I will not give up to despair. I will trust in God whatever may be the number, the power, and the confidence of my enemies. None of these things will make me despair, for as long as I have God, I have every reason for hope. No one should despair who has God as their Friend. (Psalms 42:11; Psalms 43:5).

And will yet praise you more and more — literally, “I will add upon all your praise.” That is, I will accumulate it; I will increase it. He saw abundant cause in the past for praising God; he had such confidence in God, and felt such an assurance that God would interpose on his behalf, that he did not doubt that in God’s future dealings with him, he would have every reason to “add” to that praise.