en_tn_condensed/col/03/09.md

you have taken off the old man with its practices

Here Paul is speaking of a Christian's rejecting his old sinful life as if it were an old garment that he takes off in order to put on a new garment. The old and new self mean the same as the old and new man. The term "old man" probably refers to the sinful nature with which a person is born. The "new man" is the new nature or new life that God gives a person after they come to believe in Christ.