Charles H. Spurgeon on Psalms 97:3

A fire goeth before him. Like an advance guard clearing the way. So was it at Sinai, so must it be: the very Being of God is power, consuming all opposition; omnipotence is a devouring flame which burneth up his enemies round about. God is longsuffering, but when he comes forth to judgment he will make short work with the unrighteous, they will be as chaff before the flame. Reading this verse in reference to the coming of Jesus, and the descent of the Spirit, we are reminded of the tongues of fire, and of the power which attended the gospel, so that all opposition was speedily overcome. Even now where the gospel is preached in faith, and in the power of the Spirit, it burns its own way, irresistibly destroying falsehood, superstition, unbelief, sin, indifference, and hardness of heart. In it the Lord reigneth, and because of it let the earth rejoice.