An objection arises: if faith grows through learning new commands, how could such growth occur after revelation ceased?
The answer distinguishes a command's revelation from an individual's discovery of that command. Revelation is complete, but no new learner knows every detail immediately.
A person today may learn an established duty and affirm it explicitly. No new revelation has appeared, yet that person's detailed understanding and assent have increased. This distinction answers the difficulty of restricting all growth in faith to the Prophetic era.