At the beginning of The Incredibles, the family sits down for dinner. Dash, a 4th grader, tries unsuccessfully to cut his slab of steak (which is at about eye level). He shoves a corner of the steak in his mouth and growls as he tries to bite a chunk off the slab. At this point, his mother's maternal instinct kicks in, and she says,
"Smaller bites, Dash. Yikes!" Without missing a beat, she continues, "Bob, could you help the carnivore cut his meat?" Mr. Incredible cuts through the plate and goes to get a new one (but really to read the newspaper), and chaos ensues in the dining room, and it's wonderful comic pandemonium that any parent immediately understands.
Sometimes you have to give up doing everything so you can do something.
William Zinsser wrote On Writing Well. In the first chapter, he writes about a writing panel he was on at a school.
"What do you do on days when it isn't going well?" Dr. Brock was asked. He said he just stopped writing and put the work aside for a day when it would go better. I then said that the professional writer must establish a daily schedule and stick to it. I said that writing is a craft, not an art, and that the man who runs away from his craft because he lacks inspiration is fooling himself. He is also going broke."
It's not a good reason to not do something because you don't feel like it, you're tired, or you can't think of anything to say. Those are fancy ways to say you're neglecting a gift.