siddhi or siddhiḥ (Sanskrit:सिद्धि; "perfection", "accomplishment", "attainment", or "success") — extraordinary powers of the atma (Self), developed through consistent meditation and deliberate, grueling, often uncomfortable tapas, or awakened naturally through spiritual maturity and yogic sadhana. Through the repeated experience of Self Realization, siddhis naturally unfold according to the needs of the individual. Before Self Realization, the use or development of siddhis is among the greatest obstacles on the path because it cultivates ahankara, I-ness, and militates against the attainment of prapatti, complete submission to the will of God, Gods and guru. The mastery of specific Siddhis is taught to be attained through the right kind of Samyama. There are eight primary siddhis, and ten secondary siddhis and five siddhi's specific for concentration in yoga.