In the Tree of Yoga Guruji writes,
It is relatively easy to be a teacher of an academic subject, but to be a teacher in art is very difficult, and to be a yoga teacher is the hardest of all, because yoga teachers have to be their own critics and correct their own practice. The art of yoga is entirely subjective and practical. Yoga teachers have to know the entire functioning of the body; they have to know the behaviour of the people who come to them and how to react and be ready to help, to protect and safeguard their pupils.
