In exposition and in argument, the writer must likewise never lose his hold upon the concrete; and even when he is dealing with general principles, he must furnish particular instances of their application.

A drawing should have no unnecessary lines and a machine no unnecessary parts.

Rewrite and revise. Do not be afraid to seize what you have and cut it to ribbons ... Good writing means good revising.

In exposition and in argument, the writer must likewise never lose his hold upon the concrete; and even when he is dealing with general principles, he must furnish particular instances of their application.

Instead of announcing what you are about to tell is interesting, make it so.

It is worse to be irresolute than to be wrong.

Make definite assertions. Avoid tame, colorless, hesitating, non-committal language.