Moroni has experience the power of the spirit when he has taught, and experience the frustration of writing on the plates. He can feel the difference in the two methods. The oral preaching is quick and open to the immediate control of the Spirit. Writing is more plodding, more exacting. The spirit can communicate above and beyond the words of discourse, and may similarly enhance a reader’s understanding, but the writer cannot feel that effect. The writer who reads what he writes only understands how much less of the power of the spirit remains when committed to a more permanent medium.