I would say if a man is going to write on chemistry, he learns chemistry. The same is true of Christianity. But to speak of the craft itself, I would not know how to advise a man how to write. It is a matter of talent and interest. I believe he must be strongly moved if he is to become a writer. Writing is like a 'lust,' or like 'scratching when you itch.' Writing comes as a result of a very strong impulse, and when it does come, I for one must get it out.