“The fourth agreement is about the action of the first three: Always do your best.
Under any circumstance, always do your best, no more and no less. But keep in mind that your best is never going to be the same from one moment to the next. Everything is alive and changing all the time, so your best will sometimes be high quality, and other times it will not be as good. When you wake up refreshed and energized in the morning, your best will be better than when you are tired at night. Your best will be different when you are healthy as opposed to sick, or sober as opposed to drunk. Your best will depend on whether you are feeling wonderful and happy, or upset, angry, or jealous.”
~Don Miguel Ruiz, The Four Agreements