Be like sons of obedience, not conforming to the desires of your former ignorance
Other versions
King James Version
As obedient children, not fashioning yourselves according to the former lusts in your ignorance:English Standard Version
As obedient children, do not be conformed to the passions of your former ignorance,New International Version
As obedient children, do not conform to the evil desires you had when you lived in ignorance.