From the gross to the subtle, all the chords that bind the Purusha to Prakriti are cut asunder. This snapping of the ties releases the Purusha to enjoy his Independence, Kaivalya Moksha. This is the goal of Raja Yoga. Yama and Niyama purify the individual's actions and make them more Sattvic . Tamas and Rajas which are the pillars of Samsara are pulled down through the practice of the Ten Canons of Yama and Niyama.
Inner purity is increased.
The individual's nature itself is made Sattvic. Pranayama brings the aspirant face to face with the Life-Principle. Control of this Life-Principle gives him an insight into its motive force. He is made aware of the fact that it is desire that sustains the life-force. Desire is the cause of externalization of the mind.