I'm sure we've all had bad runs where we came home wondering whether it is actually worth all the effort. I had one of those Saturday and spent a good part of Sunday re-considering my training plan and what I can do to engineer a bit more tlc into it. In the end I decided to make only minimal changes, and the reason I gave myself was:
A month from now it will only be a little more than 3 months before the taper starts. Tapering feels nice and will cure all the pains. And I'm nearly there, it would be a shame to give up now.
It sounds quite similar to the "moral support" I give myself when I'm getting tired on a long run: "Just 3 km more, then you'll be at three quarters" or "just another 2 km then it'll only be twice the distance from the mechanic to home, and you've done from the mechanic to home so many times, it's easy peasy".
What's your favourite mind trick when you want to cheat the gremlins?