Ask my brother
There are lots of people who have known me in different contexts. But my brother has a unique perspective on our growing-up years. We shared a bedroom and a lot of life.
So I find it interesting how practical and plain speaking Jesus’ brothers are. They speak to the Church—followers of their brother.
One (James) says “Faith without works is dead faith”. The other (Jude) says “grace gives no license for sin”. James requires fruit of the Spirit. Jude prohibits works of the flesh.
Apparently, the Jesus his brothers knew connected belief with actual down-to-earth behavior.