Psalms 89:1,2 - Joseph Benson’s Commentary on the Old and New Testaments

I will sing of the mercies of the Lord He speaks this by way of preface, lest the following complaints of present miseries should argue ingratitude for former mercies. I will make known thy faithfulness Assuring posterity, from my own observation and experience, that thou art true to every word that thou hast spoken, and that whatsoever hath befallen us, it proceeded not from thy unfaithfulness. For I have said That is, within myself. I have been assured in my own mind; Mercy shall be built up for ever As thou hast laid a sure foundation of mercy to David's family, by that everlasting covenant which thou hast made with it; so I concluded that thou wouldest carry on the same project of mercy toward it; that thou wouldest build it up, and not destroy it. Thy faithfulness shalt thou establish in the very heavens That is, in thy eternal counsels, which are above the changes of this lower region, and out of the reach of the opposition of earth and hell. Or, as the Hebrew may be rendered, with the very heavens; that is, as firmly and durably as the heavens themselves, as with the sun, in the Hebrew text, Psalms 72:5, is by most interpreters rendered, As long as the sun endureth, as it is in our translation. And so this phrase, in this last branch of the verse, answers to for ever in the former.