Classicly

Homer, in all probability, knew no rules of rhetoric, and was not tortured with the consideration of grammatical construction, and yet his verse will endure through time. If everybody possessed the genius of Homer, rules and cautions in writing would be unnecessary.

To-day all men speak, and most men write, but it is observed that those who most closely follow Homer's method of writing without rules are most unlike Homer in the results. The ancient bard was a law unto himself; we need rules for our guidance.

Rules of writing are the outgrowth of the study of the characteristics and qualities of style which distinguish the best writers from those of inferior skill and ability. Grammarians and rhetoricians, according to their several lines of investigation, set forth the laws and principles governing speech, and formulate rules whereby we may follow the true, and avoid the false.