John 14:26
But the Comforter, which is the Holy Ghost, whom the Father will send in my name, he shall teach you all things, and bring all things to your remembrance, whatsoever I have said unto you.
John 21:25
And there are also many other things which Jesus did, the which, if they should be written every one, I suppose that even the world itself could not contain the books that should be written. Amen.
2Ti 3:16
All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness:
Why, the two quotes from Jonh show that there are things that are of Christ not described in the Scripture, but communicated to the Church. The third quote, from 2 Timothy says that all (all, mind you, including the parts Luther threw out) scripture is inspired and profitable for the education of the clergy.
The Sola Scriptura remains an extrascriptural superstition.