“There are five different ways in which the fruits described in Chapter 3 can manifest:
1. Some people are born with this ability.
2. Through taking certain herbs in a special way.
3. Chanting Mantra can change one’s state of mind.
The chanting can be very complex.
4. Austerities can bring power and change perceptions.
This is why Tapas is mentioned as a tool in Chapter Two verse 1.
Tapas needs to be linked to a purpose, so that the heat can be redirected.
There has to be reflection as well as restraint;
you have to reflect on the effect of the restraint on yourself and on others.
5. The practice of Yoga.”
– Paul Harvey on Yoga Sūtra Chapter Four verse 1

“This is not true of those who have extraordinary capabilities by:
1. Birth
2. The use of rare herbs
3. The proper recitation of scriptures and
4. Austere eating habits and living conditions.
In them, the problems of anxiety, fear and selfishness remain.”
– TKV Desikachar on Yoga Sūtra Chapter Four verse 7