Power of will is required: when you make choices, particularly when short-term gain and long-term gain are in contest with one another; when you want to focus on a thing, especially when you are not attracted to that thing or you don`t find it interesting; when you want to relax, lower your pulse, lower your blood pressure, or control your body language; when you want to daydream [and you want to know you are doing it]; when you want to 'get present' and 'be in the now'; when you want to meditate.

Will to power is the innate force that causes us to want to vent our strengths.

When power of will and will to power are aligned...that`s mastery.