The Table Talk of Martin Luther 5

Christ once appeared visible here on earth, and showed his glory, and according to the divine purpose of God finished the work of redemption and the deliverance of mankind. I do not desire he should come once more in the same manner, neither would I he should send an angel unto me. Nay, though an angel should come and appear before mine eyes from heaven, yet it would not add to my belief; for I have of my Saviour Christ Jesus bond and seal; I have his Word, Spirit, and sacrament; thereon I depend, and desire no new revelations. And the more steadfastly to confirm me in this resolution, to hold solely by God's Word, and not to give credit to any visions or revelations.

---quoted from The Table Talk of Martin Luther