1. Always try to use the language so as to make quite clear what you mean and make sure your sentence couldn't mean anything else.
2. Always prefer the plain direct word to the long, vague one. Don't implement promises, but keep them.
3. Never use abstract nouns when concrete ones will do. If you mean "More people died" don't say "Mortality rose."
If you loved The Chronicles of Narnia, you know C.S. Lewis.
Read his above letter to a young fan -- and use his writing advice.