“Saved by grace, grown up by law?”

My friend says the Law helps Christians live their daily lives. Is this true? Are there two kinds of sanctification? How do we grow without the Law? I have several family members who say I should convert to Catholicism. What are your thoughts?

Tags: Catholicism, forgiveness, grace, growth, Law, Mary, mediator, once for all, sanctification, Ten Commandments, third use, threefold, transubstantiation, two kinds