In what sense have we "crucified the flesh"?

In what sense have we "crucified the flesh" (Galatians 5:24)?

This involves an individual change of viewpoint that began when we discovered we were without strength before God. It is not what God did at the cross nor could we have done it. They that are Christ’s began at the cross (Galatians 3:1). As a Jew, Paul recognizes he became dead to the Law when the Law’s penalty was carried out at the cross (2:19). Having been crucified with Christ, the believer lives, not by the Law, but by the faith of the Son of God (2:20). The law demanded that the flesh be obedient. After reviewing all that the flesh can produce (5:19-21), Paul insists that it cannot be obedient; therefore, Law-keeping is not Christian living. The believer’s crucifixion with Christ (2:20) declares that God is finished with the flesh. In the crucifixion of Christ, the believer sees the irrelevance of the flesh in righteous living. That is the viewpoint God intends all believers to maintain. The cross negates every suggestion that any contribution from us, that is, from our flesh, can please God. Since we began in the Spirit (3:3), He must govern our manner of life (5:25). We can become like Christ only under the control of the Spirit.

D. Oliver