[that he may work mighty miracles]: Healing is a miracle, and faith can lead to miracles, but the distinction is made in the categories to emphasize the varieties of the gifts.
Reference: This verse replicates the subject of miracles from 1 Corinthians 12:10, but alters the phrasing of the passage. The model is still evident, but the model is not being copied, but rather reworked into the text of Moroni’s declaration.