Mistakes are almost always of a sacred nature. Never try to correct them. On the contrary: rationalize them, understand them thoroughly. After that, it will be possible for you to sublimate them.
“Don't worry if you don't complete everything on the schedule. At least you will have completed the most important projects before getting to the less important ones.”
“They have stolen the public lands. They have grasped all to themselves, and by their unprincipled greed brought a crisis of unparalleled distress on forty millions of people, who have natural resources to feed, clothe and shelter the whole human race.”