Discipline in keeping our heart and mind open increases patience. Having patience gives staying power to exertion. Acting with joyful exertion for the benefit of others strengthens meditation. The mind of meditation sharpens prajna, which sees things as they are. Prajna uses the other activities to keep activating bodhichitta, our lightest mind. It’s light because it lacks the reference point of a self. This also gives us a sense of humor.
