To be a successful writer, you must achieve correctness in sentence construction. It is not enough to write sentences which are grammatically correct; you must work hard to do this.
Be careful of your writing. Try never to commit the same mistake twice. Revise whatever you write before you copy it in its final form. Do not hand in any composition which you have not corrected and revised. Always remember that success is directly proportional to the effort you make to attain it. Nothing worthwhile is achieved without trying very hard.