Fun fact: when Paul tells his readers in Colossae to "put to death, therefore, whatever in you is earthly: fornication, impurity, passion, evil desire, and greed (which is idolatry)," it's an example of a common ancient rhetorical device called a "vice list." (This is not actually fun, but bear with me.)
I’ve been dead a long time, my life hidden in Christ. Paul says the hidden life is a moral one, putting off vices like a set of dirty old clothes. The man could preach fire and brimstone when he wanted to.