Pastor Dunbar said "The Thief" in John 10:10 is The Devil, the evil enemy of Jesus and God who created and brought evil, sin, misery, and death into the world, as was the Serpent in the Garden of Eden, and Lucifer, the rebel angel.

 ¹⁰The thief cometh not, but for to steal, and to kill, and to destroy: I am come that they might have life, and that they might have it more abundantly. (John 10:10, King James Version)


I've read and heard thousands of different interpretations, some agreeing and some contradicting, including one "you can prove anything you want with the Bible".