My Dear Bhakta Avatar,
Please accept my blessings.
All glories to Srila Prabhupada.
It is not the material mode of passion. It is great enthusiasm. When passion is used in Krishna's service it is transcendental passion, just like
Arjuna's transcendental passion as a warrior fighting for Krishna. It does not burnout. It leads to greater and greater enthusiasm.
I hope this meets you in the best of health.
Your ever well-wisher,