'Flesh' in the Bible

yet Christ has now reconciled you [to God] in His physical body through death, in order to present you before the Father holy and blameless and beyond reproach—

In Him you were also circumcised with a circumcision not made with hands, but by the [spiritual] circumcision of Christ in the stripping off of the body of the flesh [the sinful carnal nature],

When you were dead in your sins and in the uncircumcision of your flesh (worldliness, manner of life), God made you alive together with Christ, having [freely] forgiven us all our sins,

These practices indeed have the appearance [that popularly passes as that] of wisdom in self-made religion and mock humility and severe treatment of the body (asceticism), but are of no value against sinful indulgence [because they do not honor God].