It is very rewarding when we finally manage to consciously turn a bad experience into a good feeling. No amount of instruction compares to what we learn after actually doing it, even when, in theory, we already knew what to expect. Doing it once, however, is helpful, but it is not enough. Because just as surely as we learn from doing it, after a while our mood will fluctuate. Then the lesson learned, the positive feeling experienced, will give way to bad thoughts and feelings. It will be necessary to deal with them, make them temporary, if possible brief, and supplant them with the memory of that lesson. They can never be suppressed. Therefore, we must be humble, and never give in to the temptation to believe, for a single moment, that we are absolute masters of ourselves.