To be a disciple of any person or profession is to be more than just a follower. A disciple who is an apprentice to a master craftsman should be willing to learn all that there is to know about their chosen vocation. When a person gives their life to the Lord they have become apprentices or disciples for the Lord's chosen work for them. Their main tool of trade is the written Word, the Bible, which they are to learn to use skillfully under the wise tutelage of the Holy spirit of God.