How to balance excellence and dispassion?
Whenever you are out of balance, it pinches you. Listen to the pinch, that's all. If you have too much passion and no dispassion, you will lose night's sleep. When you cannot do anything, you cannot meditate and passion catches you like a fever, then remember dispassion. Know that there is a bigger power that is taking care of everything, I have nothing to do! Then you will become calmer.
Remember the dream nature of everything. Everything is a dream, then the dispassion comes up automatically. If you find yourself being too lazy, thinking everything is dispassion and why do I have to do anything? Why do I even have to do my yoga class in the morning! C'mon! Wake up, do something. Never mind if it's a dream, you have to do something in the dream also.