Have you ever run into "writer's block"? I don't think there is an author/writer out there that has not been through this a time or two during their career. I certainly have. I have written 4 books, 3 currently published and I can tell you there were days when I either didn't want to continue (for various reasons) or just got plain stuck and didn't know which direction to go in.
In those moments, I just had to stop and step away from it. Do other things to take my mind off of it for a while. I did not want to force myself to produce if it wasn't going to be genuine so I stepped back and gave myself some breathing room, not to put too much pressure on myself.
On my second book, "The Music Through the Storm", I remember sitting at my dining room table writing in the late hours of the night and just went blank! I tried to force another sentence or two just finish the chapter I was writing and finally just had to push away from it.
I began to think about the book as a whole and what story I set out to tell in the first place and after two (2) months or so, words and thoughts just came out of nowhere, really. I immediately got my notebook and starting writing where I left off, even changing some things around to fit where I was taking this chapter.
Before I knew it, over the course of the next few months my book was finished! So, taking a step back when facing writing road blocks, it's necessary in order to produce your great works! Write on.