Great points! I would also add, "learn from what you can, let go of the rest." All failures provide lessons, but if we don't learn them, we will keep repeating them over and over. And at the same time, some failures are not due to any mistakes, they are just incompatibilities. It is no use going through all the what ifs around the incompatibilities, the best you can do is learn how to recognize them in advance so that next time you don't get into the same situation!