This truth is so well established in the Bible that some people make no distinction between the Father, Son, and Holy Spirit but believe they are simply one God expressing Himself in three different ways.
Jesus makes a distinction between Himself and His Father here and uses Himself and His Father as two different witnesses to fulfill the requirement of Deuteronomy 17:6. Jesus would have been deceiving these Jews if there was no distinction between His Father and Himself; and yet, they are one (John 10:30; 1 Jn. 5:7). This is a great mystery and yet a very well established fact in the Word of God.
One of the great statements of the Old Testament from Deuteronomy 6:4 says, "The Lord our God is one Lord." We do not have three Gods, but one God, clearly identifiable as three persons. This is a great mystery, which has not been adequately explained.
The Bible reveals the truth of the Trinity, but make no attempt to explain it. We simply accept this revelation as it is, until we know all things, even as we are known (1 Corinthians 13:12).
Jesus said that the witness of His Father was the greatest testimony of who He was. Everyone can hear His testimony of Jesus through the Word of God.
Moses and all the Old Testament prophets spoke of the coming of Jesus, and Peter said the written word of God was a more sure word of prophecy than the audible voice of God.
