The easiest day to lower your standards is the day they matter most.

The days that most tempt you to lower a standard are usually the important ones, because that is when the pressure, the exhaustion, and the stakes all arrive together. Ordinary days do not test anything; they are easy to be good on. So the exception you grant yourself under pressure lands precisely where it does the most damage. That is not bad luck, it is the structure of the situation.

When you notice a strong case for making an exception, pause and check whether the moment is unusually important. If it is, that is an argument for holding the line rather than relaxing it. Decide the hard cases in advance, while the day is still ordinary.