Charles H. Spurgeon on Psalms 89:42

Thou hast set up the right hand of thy adversaries. Thou hast done it, thou, who hast sworn to give him help and victory, thou hast, instead thereof, sided with his enemies, and lent them thy strength, so that they have gained the supremacy. Thou hast made all his enemies to rejoice. They are boasting over him, and are glorying in his defeat, and this is done by thyself. O God, —how is this? Where is the covenant? Hast thou forgotten thine own pledges and promises?