Give more than you receive. That is the principle I tell all my students.
As long as you do not live totally in the body, you do not live totally in the Self.
The ultimate goal of yoga is to realize the brilliance of your soul.
You must purge yourself before finding faults in others.
Not all practitioners can jump to that highest level. They have to climb, step by step from the physical sphere to reach the spiritual sphere. If it is treated as exercise it is not the fault of yoga but of the practitioners.
Without education, confidence does not come.