It's just that on other days, whether or not I'm able to write at all depends on how well I can keep my blinders on, and I've had a few bad experiences where I was winging along, writing writing writing, then got a piece of criticism--quite minor--and suddenly staggered, threw a shoe, and went crashing off the track, derailed, stalled, etc. So I probably err on the side of caution and cultivate this principle of avoidance.
Must go. My thought is done. So is my toast.