Sifting through the old sketch book

I was in my storage looking at a old sketch book for a drawing I wanted to complete.  After I found it I began sifting through other sketches.  Several sketches would mark areas of time or interest in subjects like when I took 3d Sculpture in College, doing a study of downtown Nashville, etc.  I found some good work but lots of incompletes.  Drawings that had a good direction but because of my doubt, I would stop and leave it.  It's a shame cause some of the drawings would make nice little framed pieces if completed.  It makes me think of the self doubt I heard about the other day while watching a youtube video from a artist.  She talked about the same type of doubt and to not let it get to her and work through it or stop for a while and come back to it the next day.