Have you ever wondered how to defend your belief that Jesus is Lord? If so, this post will show you how to prove that Jesus is fully God.
In order to determine if Jesus Christ is really God, we examine Christ’s own claims. Jesus Christ claimed to be God. If His claim is true, then half of this theological battle is won.  If His claim is not true, then we lose the battle… and a whole lot more.
In his book More Than a Carpenter, Josh McDowell points out that there are only three possibilities to explain Jesus’ statements about Himself. Jesus Christ was either a liar, a lunatic, or He is truly the Lord.  James Montgomery Boice adds a fourth possibility by pointing out that many people state that Christ was merely a “good man.” 
Liar, lunatic, Lord, or “good man”?
Let's examine the fourth possibility first. Was Jesus just a “good man”?
Uh, no. A “good man” does not lie or mislead people. Jesus claimed to actually be God, and He would have been lying if He was only a “good man.”
Furthermore, Jesus directed people to believe in Him–and in Him only–for access to God.  If He was a “good man,” He would not have stood in the way of the people’s access to God in this manner. If Christ had been only a “good man,” we would more properly have to call Him a “con man.”
Jesus' claims are too extreme for Him to be merely “good.” Therefore, we must abandon this concept that Christ is merely a good man or a good teacher. He must be Something else.
Was He a liar, perhaps?
Can Jesus just be a liar? The facts are against it. Jesus proved Himself to be truthful by foretelling many events:
- With perfect accuracy, Jesus predicted that Peter would betray Him; 
- Jesus predicted the manner of His own death, and resurrection from the dead; 
- the descending of the Holy Spirit at Pentecost; 
- the destruction of Jerusalem; 
- Paul’s sufferings and ministry to the Gentiles; 
- political and religious events; 
- and many other events.
Additionally, few people are willing to maintain a lie in the face of persecution, but Jesus stuck with His own statements no matter what. Think about it:
- Jesus lived in a country full of monotheistic, fanatical Jews. 
- These Jews believed in one God – Jehovah. Their law demanded death for anyone who blasphemed this doctrine.
- In this environment, Jesus proclaimed to all who would listen that He, Himself, was God.
One of my favorite authors, James Montgomery Boice, points out that “The remarkable thing is that he got people to believe in him. Lots of people—men and women, peasants and sophisticates, priests, eventually even members of His own family.” 
People flocked to Jesus, even though the Jews were extremely watchful against anything that contradicted their monotheistic doctrine. It would have taken a personal encounter with God, and with the radical truth that Jesus Christ, the God-Man, is the Savior of the world, for any Jew to believe His claims; yet thousands of them did.
Few liars are willing to die for a lie. However, Jesus stuck with His claims; He eventually gave up His own life to support His claims. This proves that Christ was not a deceiver or a liar. Everything about His life and ministry blasts the resounding sound of truth.
Was Jesus insane, a lunatic?
Perhaps Christ was insane, or at least mentally ill? Nope. The facts do not support this theory either. We know this because, first, God Himself confirmed the words Jesus spoke by performing great signs and wonders.
- Jesus raised the dead;
- healed the sick;
- opened blind eyes;
- cast out demons;
- turned a couple of fish and a few loaves of bread into enough food to feed thousands of people;
- turned water into wine; and more.
Additionally, Jesus spoke with power that changed hearts. One notable example of this is when the fanatical Jewish religious leaders of Israel sent their minions to arrest Him. However, but after listening to Him preach, the minions refused to lay hands on Him. Instead, they said, “No man ever spoke like this Man!” (John 7:46).
Jesus' words brought life, hope, strength, and help–and still do. Insanity doesn't produce words that give life.
Check out what Boice said about this:
Before we jump too quickly at that explanation we need to ask whether the total character of Jesus (as we know it) bears out this speculation. Did he act like one who was crazy? Did he speak like one suffering from megalomania?
It is hard to read the Gospels and be satisfied with this explanation. Rather, as we read the Gospels the conclusion seems to be forced upon us that, rather than being mad, Jesus was actually the sanest man who ever lived. He spoke with quiet authority. He always seemed to be in control of the situation. He was never surprised or rattled. He will not fit that easy classification.” 
Jesus was not insane.
Not a “good man,” not a liar, not a lunatic… then what?
If Jesus was not a liar, a lunatic, or merely a good man, what possibility remains? The only remaining option is that Jesus is what He claimed to be: God Himself, the Only Begotten Son of the Father.  He is fully God.
Jesus is God. He is equal with the Father and the Holy Spirit, very God of very God. Do you know Him today? If you don't know Jesus Christ personally, click here and let me introduce you to my Best Friend.
 John 8:57-58, NKJV
 McDowell, Josh, More Than a Carpenter, 33
 Boice, Foundations of the Christian Faith, 275-276
 John 14:6, NKJV
 Luke 22:34, NKJV
 Luke 18:31-33, NKJV
 Luke 24:49, NKJV
 Luke 21:6, NKJV
 Acts 9:15-16, NKJV
 Luke 21:17-28, NKJV
 Boice, Foundations, 277
 Ibid., 277
 Ibid., 276
 John 3:16, NKJV