John Piper exmplains the gospel in wonderful transactional language.

I will try to show that Christ has become our
substitute in two senses: in his suffering and death he becomes
our curse and condemnation (Galatians 3:13; Romans 8:3). And
in his suffering and life he becomes our perfection (2 Corinthians
5:21). On the one hand, his death is the climax of his atoning sufferings,
which propitiate the wrath of God against us (Romans
3:24-25); on the other hand, his death is the climax of a perfect l
ife of righteousness imputed to us (2 Corinthians 5:21; cf.
Romans 4:6, 11 with 3:21-22; 5:18-19).