Every writer has had those sections that give them problems. They will be moving right along and then there is this part that just refuses to fit. They know it needs to be there. Otherwise the plot will not make sense or readers will not appreciate the argument being made or that one line of crystalline description will be orphaned.
John Steinbeck knew what to do in that situation. Take this item from a 1962 letter:
If a scene or a section gets the better of you and you still think you want it—bypass it and go on. When you have finished the whole you can come back to it and then you may find that the reason it gave trouble is because it didn’t belong there…
Writers are always told to cut out the troublesome bits. But that does not always feel right at first. Sometimes you need to let it sit for awhile before you are able to put it out of its misery.
(h/t: Brain Pickings)