John Calvin Commentary Colossians 3:7

"wherein ye also once walked, when ye lived in these things;" — Colossians 3:7 (ASV)

In which you walked. Erasmus mistakenly refers this to men, rendering it, “inter quos,” (“among whom,”) for there can be no doubt that Paul had in view the vices, in which he says that the Colossians had walked, during the time that they lived in them. For living and walking differ from each other, as power does from action. Living holds the first place; walking comes afterwards, as in Galatians 5:25.

If you live in the SPIRIT, WALK also in the Spirit.

By these words he intimates, that it would be an unseemly thing that they should addict themselves any more to the vices, to which they had died through Christ. See Romans 6. It is an argument from a withdrawal of the cause to a withdrawal of the effect.