On Romans 8:1-4, Reflection And Observation

Having read Romans 8 countless times, it is easy to oversee the intricacy and brilliance of Paul's argument. There are so many things to think about. For instance: what is the Spirit of life in Christ Jesus; or what is the relationship between no condemnation (v. 1) and the condemnation of sin in the flesh (v. 3); moreover, who is the "He" in v. 3; further, what do we do with the en hemin in v. 4; finally, what was Paul doing with the tois in relation to the hemin and the following kata limiting qualification in v. 4?

1 Therefore there is no no condemnation for those who are in Christ Jesus. For the law of the Spirit of life in Christ Jesus has set you free from the law of sin and death. For what the law could not do, weak as it was through the flesh: God did: sending His own Son in the likeness of sinful flesh and as an offering for sin, He condemned sin in the flesh, 4 so that the requirement of the Law might be fulfilled in us, who do not walk according to the flesh but according to the Spirit.

- Romans 8:1-4