We Know God by Looking at Jesus

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I listened to a Tim Keller sermon about John 1 in which he focused on the revelation that the Word was in the beginning; the Word was with God, and the Word was God, and God’s Word became flesh and dwelt among us. You can follow the link in the last sentence to read a summary of the beginning of the message.

Keller says:

“Jesus is the supreme revelation. If we are to know God, neither rationalism nor mysticism will suffice. For God chose to make Himself known finally and ultimately in a real historical human being.”

Keller doesn’t break that statement down, but he provides an illustration of how rationalism is insufficient to know God. I will summarize Keller’s illustration and provide one of my own for why mysticism can’t be relied upon for knowing God. Neither are sufficient, alone, to enable us to know God, and the reason why is that God revealed Himself in the person of Jesus.

A person might say that he would believe in God if we can prove that God exists. He is looking for evidence, reasons, rationality. There is a wealth of evidence, reasons and a rational basis for believing that Christianity is true, but this person might be looking for “proof”, as in an irrefutable, unquestionable case.

This is the “wrong path”, says Keller, because of what he calls “philosophy 101”. Any philosophy professor worth his salt will explain in an introduction to philosophy course that there are no philosophical proofs, in any absolute sense. Absolute proof doesn’t exist outside of mathematics and logic.

For example, there is no way for me to prove that I am not a butterfly dreaming that I am writer. If I say that I know who I am, and I know what I am doing, I am using my cognitive faculties. I am assuming that my cognitive faculties are working accurately, but you might not be willing to assume they are working correctly. If you demand that I prove that my cognitive faculties are working correctly, how do I do that?

I can’t prove that my cognitive faculties are working properly without using my cognitive faculties that I am trying to prove are working properly. I can’t do it without begging the question and assuming the very thing I am trying to prove.

All of our philosophical proofs break down at the point of tautological premises we assume.

If I accept the challenge to prove Christianity in a rational sense to a skeptic, and if the skeptic is honest, the skeptic himself would have to admit that he is assuming certain beliefs. Those beliefs he assumes are premises that themselves are not provable in the way he asks for proof of Christianity.

Rationality is not the right path for weighing the validity of Christianity according to Keller.

While Keller doesn’t get into why mysticism is not the right path, I will take a stab at it. Mysticism is the religious experience of the individual. If we rely on nothing other than our religious experience, we are using nothing but our own sense of direction (our inner compass) in determining what is truth.

Consider being lost in the woods with a compass that, instead of pointing at true North, always pointed back at you. How would you ever get out of the woods? How would you know the direction you are going?

Mysticism, personal religious experience, may be something meaningful for you and suggest the existence of spiritual things for which you rightly long, but it can’t be the anchor of truth for you because it is ultimately subjective. It can’t guide you beyond where you are standing at any given moment.

Going back to the text, we read that, “In the beginning was the Word, and the Word was with God, and the Word was God.” The Greek word that is translated “Word” in this passage is lógos from which we get our word, logic.[1] To the Greek, this is saying, basically, that Jesus is the logic or reasoning of God.

God has not given us abstract proof. He has not given us an inner compass pointing true north. God has given us proof in the Person of Jesus. Jesus is the compelling proof.

This is not anti-rational. Rather, we must start with Jesus. We have to look at his life. We have to consider his claims and his teaching. We have to compare those things to the way he behaved. We have to consider the accounts about his resurrection, and we use our minds, our rationality, to do this. If we do this with an open mind we find that Jesus is compelling proof.

I would add that God’s offer of the proof of Jesus doesn’t discount personal experience either. If we test belief in Jesus out with an open and committed mind, we find that we are not disappointed. We experience communion and intimacy with God. As Paul says, the Spirit of God testifies with our spirit.[2]

Jesus was perfect. Keller says, “His life towers above all other lives.”

Craig Hazen says that we should start with Jesus in our spiritual quest because he is “the universal figure”. Every religion tries to coopt and claim Jesus as its own, from Buddhism to Islam to Bhai.

Keller concludes that Jesus is the compelling proof of God. The reasons and the experience follow and support the claim, but the proof is in Jesus. We know God by looking at Jesus. This is exactly what we see reflected in what Jesus said and the testimony of his followers:


  • “Anyone who has seen me has seen the Father.” (John 14:9)
  • Jesus is “exact representation of [God’s] being….” (Hebrews 1:3 NIV)
  • “For in Christ all the fullness of the Deity lives in bodily form….” (Colossians 2:9)
  • “The Son is the image of the invisible God, the firstborn over all creation. For in him all things were created: things in heaven and on earth, visible and invisible, whether thrones or powers or rulers or authorities; all things have been created through him and for him. He is before all things, and in him all things hold together. And he is the head of the body, the church; he is the beginning and the firstborn from among the dead, so that in everything he might have the supremacy. For God was pleased to have all his fullness dwell in him, and through him to reconcile to himself all things, whether things on earth or things in heaven, by making peace through his blood, shed on the cross. (Colossians 1:15-20)



[1] Lógos comes from légō, which means “speaking to a conclusion”. It means a word; the expression of a thought; a saying. Broadly, it means “reasoning expressed by words”.  Lógos (“word”) is preeminently applied to Christ in John 1:1, the eternally pre-existent Word who expresses the thoughts of the Father through the Spirit.

[2] Romans 8:16

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