Sutra 12 Abhyasa-vairagyabhyam tan-nirodhah

abhyasa: sustained effort; focused and continuous conscious intent.

vairagya: Raga means attachment, desire, craving, or attraction in general, where vairagya is its remediation, release; the letting go of attachment, attractions, non-grasping, unclenching, the release of temporal preferences, grasping, anticipation, or expectation. Vairagya leads to the ultimate freedom from desire, but not through repression or aversion (dvesa), but through relaxation/release of that which is burdensome and useless. Hence, vairagya is the practice that frees us from neurotic desire, and thus the realization of non-dual love itself. The temporal love for things/objects has vanished and has been replaced by eternal love -- divine passion. Therefore, it is said that vairagyam is the realization of divine or sacred love where no mundane love can arise. When this realization is established, vairagya is absolutely effortless, spontaneous, and natural -- as a natural expression free from neurotic attachment. Simple logic dictates that grasping onto something which is ever changing is foolish and futile, but that is what the egoic mindset, does while grasping on to world views and belief systems that are not grounded on a stable base. This is why Sri Patanjali offers vairagya as the primary remedy for the citta-vrtti.