Johnv, eliyahu doesn't ask for forgiveness because he believes he is perfect. Can't you see that?
If you truly believe and want to prove that Bread becomes His body and Wine becomes His Blood, then you must prove it scientifically by showing the contents of the cup contains Hemoglobin and the bread became Protein of Human flesh.
Now this is just plain stupid. We can not prove scientifically that God created the heavens and the earth in six days but we believe that because He said He did. Why then should we have to prove scientifically His presence in, with, and under the bread and wine of Holy Communion?
When Zwingli debated with Martin Luther about Consubstantiation, Martin Luther was not a partner to Zwingli regarding the Bible knowledge since Zwingli was by far expert in Bible. Luther just repeated the presence of Jesus and that Jesus said this is my body.
You're right Martin Luther was not a partner to Zwingli. He was Zwingli's superior, because he was well versed enough to know that we cannot understand nor explain the ways and means of God and that we just have to take Him at His word. Not everything can be understood or explained "scientifically."
Second, Luther would not have defended "consubstantiation" because the term says things Luther did not. Con means with and Luther never simply said with when delving into the nature of the Lord's Supper. Luther stated in, with, and under the bread and the wine. This is a short hand way of saying that we cannot hope to explain how the Body and Blood are present but we know and truat that it is because the Lord said it is so, to say anymore would be to try to explain that which is not explained in Scripture but is accepted by faith.
1 John 1:8-10 8 If we say we have no sin, we deceive ourselves, and the truth is not in us. 9 If we confess our sins, he is faithful and just to forgive us our sins and to cleanse us from all unrighteousness. 10 If we say we have not sinned, we make him a liar, and his word is not in us.
I confess daily that I am a sinner and I trust that God is faithful and just and will forgive my sins.