The Two Essential Pillars of Yoga
Two things are needed for the ending of mental modifications (vrittis). One is abhyasa–sustained spiritual practice. This is why Krishna speaks of abhyasa yoga. The other is purely psychological: vairagya: “Non-attachment; detachment; dispassion; absence of desire; disinterest; or indifference. Indifference towards and disgust for all worldly things and enjoyments.”