Psalms 89:18 - Matthew Poole's English Annotations on the Holy Bible

This verse gives a reason of the psalmist's confidence that their horn would be exalted. The Holy One of Israel is our King; having therefore so potent a Friend, we have no reason to despair of our restitution to our former felicity. Or, as the words may well be, and are by divers, rendered, Of or from the Lord is or was our shield, (to wit, our king, as it is explained in the next branch of the verse, compared with Psalms 47:9) and of or from the Holy One of Israel, i.e. the Lord, who is oft so called, is or was our king. He gave us our king and royal family at first, and therefore he can easily restore it when he sees it fit.