Charles H. Spurgeon on Psalms 111:5

He will ever be mindful of his covenant. This clause would seem to be introduced parenthetically —a passing thought, a happy thought, presenting itself spontaneously to the psalmist's mind, and immediately expressed with his lips. It will be observed it is in the future tense, while all the other clauses are in the past —"He hath made his wonderful works to be remembered"; "He hath given meat unto them that fear him"; "He will ever be mindful of his covenant"; not he hath ever been. Dwelling on these past favours of God to Israel, it is his joy to think that they were but partial fulfilments of a covenant promise, which still remained, and in its highest sense should remain for ever; and that covenant itself the memorial or type of the better, the spiritual covenant, the gospel. So out of the abundance of the heart his mouth speaketh, and he celebrates God's promised truth to Israel as the memorial and pledge of his eternal faithfulness to the New Testament Israel, his blood ransomed church. —James H. Vidal.