"This sentence has five words. Here are five more words. Five-word sentences are fine. But several together become monotonous. Listen to what is happening. The writing is getting boring. The sound of it drones. It's like a stuck record. The ear demands some variety. Now listen. I vary the sentence in length and I create music. Music. The writing sings. It has a pleasant rhythm, a lilt, a harmony. I use short sentences. And I use sentences of medium length. And when I am certain the reader is rested, I will engage him with a sentence of considerable length, a sentence that burns with energy and builds with all the impetus of a crescendo, the roll of the drums, the crash of the cymbals- sounds that say listen to this, it is important."
 - Gary Provost

I know having sentence variety is a pretty basic rule for most writers out there, but I really like how Gary Provost put it so simply but still really manages to make it effective. By reading it once, the audience can't help but think that they can so easily make a writing so much better by changing the length of the sentences and making them unique. However, the writer still has to take into consideration the unity of the paragraph to make sure the sentences compliment each other.