Because is beneficial to understand at the deepest level the purpose of yoga and the science of practicing. The yoga sutras of Patanjali explain in wide level the aim of practicing yoga and its relationship between daily practice yoga and life. The philosophy is the main character in the eight limbs which are: Yamas (rules of conduct), Niyama (rules of personal behavior), Asana (physical posture), Pranayama (breathing control), Pratyahara (control of the senses), Dharana (mind control), Dhyana (meditation) and Samadhi (absorption).
The more the student understand the meaning of each limb or yoga sutra is going to affect in a positive manner not only the asana practice but the way they live the life. When a student star doing yoga will notice some difference of this and a sport, as yoga is, in reality, a spiritual practice, not a physical one. Whit this in main in easy to understand the importance of study the scriptures of Patanjali.
The practice of yoga has to lead a philosophical connection at some point, where the student can ask themselves how I can develop better my practice. Here is when the learning of the sutras will help to advance and progress. For example when a person are struggling white one posture and for accident push him or herself further provoking an injury in their body. This will lead to a possible reflexion of why this happened? If the yoga is clear on not have injuries when practicing. So the yoga sutras are brought it up, as they are organized on a wide level, where the asanas are some moral and behavior rules of life. That means the person will star asking and reflexion on the first limbs before doing an asana. Then with more study and practice the person can change some thought and behaviors, which makes the person, better in every role, this could have. It is here when the learning and understanding of the yoga sutras come into a must learning.
Author:- Yogi Chetan Mahesh