Spirituality is a key feature of Bhakti, Karma, and Raja classes. However, physical based styles like Hatha and Vinyasa don't need to touch the deeper aspects of spiritual beauty. Eventually, student who practice for physical purposes for years will find their own spiritual beauty based upon their own religion. Therefore, don’t sanitize your lessons by removing all traces of deeper meaning, but remember to stay safe. Make spiritual practices an optional part of your Yoga school. Keep your energy positive and welcoming to all who step into your studio and respect the diversity in all of your students.