Understanding nature through analysis using science, mathematics, and astronomy, medicine etc. comes under this method.
Great scientists/mathematicians used their gifted intelligence for the good in society.
Sankhya yoga teaches them in their own ‘words’, how to search beyond their scientific/mathematical formulae.
There are some similarities to Jnana yoga path. Once again this path is suitable for very few in society.
It is also difficult to measure one’s progress in a spiritual line.
One of the difficulties for an individual is to choose among these paths. It mainly depends on one’s taste, environment and availability of Guru.
Once a path is chosen one must stick to it and continue, without drifting to another. Who jumps from one path to another, without gaining considerable experience in a path, will never reach the goal. (‘A rolling stone gathers no moss’).