You may use other forms of the word, or replace a series of words with one word, but you cannot change the meaning of the sentence. Be definite, be forceful, and be clear. Almost every piece of vigorous writing is usually quite concise. Any given sentence should perhaps contain as few unnecessary words as possible, and any paragraph should contain as few unnecessary sentences as possible, and this is for exactly the same reason that in my opinion any good drawing should have very few unnecessary lines and any workable machine should have little or no parts that do not have to be there. This kind of approach does not require that the writer of prose make every last one of his sentences short, or that he avoid all description which includes detail and treat the subjects of his prose only in a skeletal, cursory way, but that every word tell as much as it can whenever it is possible.
Vigorous writing is concise.
A sentence should contain no unnecessary words, a paragraph no unnecessary sentences, for the same reason that a drawing should have no unnecessary lines and a machine no unnecessary parts. This requires not that the writer make all his sentences short, or that he avoid all detail and treat his subjects only in outline, but that every word tell.