“The aim of the analytical study of the material world is to find the soul of existence. The soul of the material world is Vishnu, or the Supersoul. Devotional service to the Lord entails service to the Supersoul. One process is to find the root of the tree, and next to water the root. The real student of sankhya philosophy finds the root of the material world, Vishnu, and then, in perfect knowledge, engages himself in the service of the Lord.” (Shrila Prabhupada, Bhagavad-gita, 5.4 Purport)