Sometimes I stand at a distance and look at the cross, and see that Jesus suffers there alone. He is there, and I am not. He is dying, and I am not. He is enduring the wrath of God, and I am not. All of which is amazing, because everything that he is going through is everything that I deserve but will now never face.
That is the glorious gospel truth that Christ is my substitute.
Sometimes I look down from the cross, and realise that Jesus' suffering there includes me. I died with him. I am there. My old, sinful self died as he died. My old identity as a sinner died as he died. My old way of living and looking at the world died completely as he died. Which is equally amazing, because it means that I can be a new person now - I can change.
This is the glorious gospel truth that Christ is my representative.