The second principle of paragraph construction is Order – that is, logical sequence of thought or development of the subject. Events must be related in the order of their occurrence, and all ideas should be connected with the leading idea and arranged according to their importance or order.
Note: The two most important sentences in the paragraph are the first and the last. The first, which should as a rule be the topical sentence, should arouse the interest of the reader; and the last should satisfy it. The first, or topical, sentence states the topic – a fact, a statement, or a proposition; the last should bring the whole paragraph on the topic to a conclusion, or summing up.