Many days, when you’re convinced that you just can’t get it done, that’s not the case.
Instead of debating with yourself, push past the resistance, sit down in your chair, and begin. Then see what happens.
And some days, you just can’t.
Something happens, internally or externally, that is outside the bounds of normal and outside of your ability to stretch. It’s just not happening.
On these days, you give yourself a pass. You forgive yourself generously. You recognize that discipline is one thing, but that you’re still human.
Go and get some rest, give yourself a chance to recover, and start again tomorrow.