Scripture is the story of God’s love relationship with His creation. As such, it focuses on how that story unfolds and is entwined with our own. From the opening verses that declare God’s judgment on sin while promising divine intervention and resolution, it is entirely caught up in God’s pursuit of sinful man. The Old Testament could accurately be described as a divine promise that God relentlessly seeks to keep despite man’s best efforts to outrun and thwart. When we understand and remember that Jesus is the physical manifestation of the invisible God, we can better understand and recognize that the Old Testament is just as much about Jesus as is the New Testament.
The divine manifestation of God walking in the garden in the cool of the evening is that self same person sitting at Jacob’s well asking for a drink from the Samaritan woman. The presence of God that Moses and the elders observed on the mountain (Ex 24:9-11) was most certainly the Son, the invisible God in human form. When we remember this, it makes the story take on a very different hue. It means that the story hasn’t changed, it has only become understandable. It is somewhat like in the Wizard of Oz when we suddenly realize that the “man behind the curtain” is the Great and Powerful Oz. The things that were somewhat confusing suddenly make sense.
When we have the realization that Jesus didn’t become the physical manifestation of God at that particular point in time known as the advent but has always been the Son, then a light turns on and we go, “ah, now it makes sense.” The trinity is not a NT concept, it is a biblical concept. The incarnation may have occurred in history, but the Son is eternal. The Old Testament is about Jesus because he ISN’T plan B, he IS and always has been plan A!
With those concepts in mind, there is no other way to interpret the Old Testament than as Christocentric. To be honest, in my mind the Old Testament doesn’t make sense without the New Testament. If you take the OT and try and understand it without the NT then it is simply an unfinished story or an unfulfilled promise. At every turn in the OT God makes promises of redemption, restoration of the remnant. Either God has gone eerily silent, or he has spoken and we weren’t listening. However, if you read and understand the the Old Testament in light of the New then his voice comes ringing through, loud and clear. How do we interpret the OT in a Christocentric way? By seeing, hearing, recognizing that when God appears or speaks in those ancient stories he does so in and through the Word, the living Son of God. The “man behind the curtain” in the Old Testament story is the eternal Son revealed to us as Jesus, the carpenter of Nazareth in the New Testament story.