John Piper writes:
What the Bible teaches is that God becomes 100% irrevocably for us at the moment of justification, that is, the moment when we see Christ as a beautiful Savior and receive him as our substitute punishment and our substitute perfection. All of God’s wrath, all of the condemnation we deserve, was poured out on Jesus. All of God’s demands for perfect righteousness were fulfilled by Christ. The moment we see (by grace!) this Treasure and receive him in this way, his death counts as our death and his condemnation as our condemnation and his righteousness as our righteousness, and God becomes 100% irrevocably for us forever in that instant.