Thought from Luther on the Transfiguration:

“This is His command, ‘This is my beloved Son; hear him.’ In Him I have come down to you, so that you can see Me, and hear Me, and touch Me. There and nowhere else shall all find M, who desire Me and long to be free from their sins and saved. On this world we should immediately seize, and say: Here God Himself speaks. I will follow Him and listen to no other word or preaching, and neither learn nor know anything else about God. For in this Person (says St. Paul) dwells the fullness of the Godhead, and apart from Him there is no God that I can meet or draw near to. And where this man’s word is heard or His work seen, the word and work of God are truly heard and seen.”

(Martin Luther, Exposition of John XIV, WA 45.520f; translated in Day by Day We Magnify Thee).