The letter to Timothy was scripture.
I don't know what you mean when you say, "the Old Testament also teaches “The WORD of GOD” but a closed Book to “The “Un-Regenerate” Person."
That sounds like Lutheran and Calvinism to me.
No one gets regenerated unless they obey Jesus' teachings in the New Testament.
The new testament was being spoken and written by the apostles and their helpers.
Right. The types and shadows were about Jesus. The whole old testament is about Jesus, not yet known as Jesus. However, since John the baptizer, it is the new testament.
Jesus is the Word of God, and was God, and is the one speaking in the Old Testament not yet come as Jesus.
The only way to eat of Jesus is to obey him. Jesus gives understanding to those who obey him. Jesus reveals himself and gives understanding to those who obey his teachings. We have to be careful to obey him and check out carefully everything we have been taught.