You start a novel with an idea and leap into the first scene, knowing that the beginning can be scrutinized, revised, or even changed later. You race to the imagined ending, the reason for your book, only to find it far away. Treading water isn't enough, you'll bore your reader. To keep a reader's interest, every scene needs to add depth to the characters as well as twist and carry the plot. The middle contains the adventures that take the reader from beginning to end. the story is the journey.
So here's to middles, make them strong, make them worthwhile, and never forget how important they are.