Miracles confirm Law and Gospel; God would not lend omnipotence to a lying claim

Besides, that the doctrine handed down in the Scriptures — and so Scripture, which is its foundation — is divine and flowed from God is proved from the miracles done in confirmation of that doctrine. For since Scripture and heavenly doctrine have two chief parts, Law and Gospel: the law was confirmed by those wonders that happened in the desert — that the living voice of God speaking was heard from the midst of fire, that for forty years manna rained in the desert, that water was often led out from the rock, and that the Israelites' clothes were not worn out in that whole time, and more of that kind. To the Gospel almost infinite miracles of Christ bore witness; then those visible and plainly stupendous gifts of the Holy Spirit poured out on the first believers, so that suddenly they spoke in various and foreign tongues, healed any diseases, expelled demons, and performed very many other wonders. Since such things are above nature's powers, it is necessary that God exercised his power in them. But it is unholy to think God willed to use his omnipotence to make faith for a Scripture and doctrine falsely and injuriously ascribed to him, as if he had willed by compact with men to lie.