(Avidyā): “Nescience” or “ignorance,” is a synonym for ajnana that denotes spiritual ignorance. According to the Yoga Sutras, it is the first and the most important of the five kleshas (causes of suffering that bind humans to the cycle of rebirth). In fact, it is the root cause of the other four kleshas. In the Yoga Sutras (2.5), Patanjali says: “Ignorance (avidya) is seeing [that which is] eternal, pure, joyful, and [pertaining to] the Self as ephemeral, impure, sorrowful, and [pertaining to] the non-self (anatman).” Read more.