All writing is ultimately a question of solving a problem. It may be a problem of where to obtain the facts or how to organize the material. It may be a problem of approach or attitude, tone or style. Whatever it is, it has to be confronted and solved. Sometimes you will despair of finding the right solution – or any solution. You’ll think, “If I live to be ninety I’ll never get out of this mess.” I’ve often thought it myself. But when I finally do solve the problem it’s because I’m like a surgeon removing his 500th appendix; I’ve been there before.

Unity is the anchor of good writing. So, first, get your unities straight. Unity not only keeps the reader from straggling off in all directions; it satisfies the readers’ subconscious need for order and reassures them that all is well at the helm. Therefore choose from among the many variables and stick to your choice.