siddhih attainment, power
tapasah ascetic devotion, a burning desire to reach perfection, that which burns all impurities, self-discipline
Self-disciplinz (tapas) burns away impurities and kindles the sparks of divinity.
Self-discipline destroys all impurities, perfecting the body, mind and senses, so that consciousness functions freely and accomplishes divinity.
Ahimsa cannot be properly understood without reference to tapas. Tapas is the inner himsa (violence) by which one creates the possibility of outer ahimsa. Ahimsa cannot exist alone. A complementary force must necessarily exist. Mahatma Gandhi would never have been able to summon up the implacable peacefulness, which moved an empire, without his ruthless attitude towards the own self. Violence is perhaps too strong a word for tapas, but it is a burning inner zeal and austerity, a sort of indefatigable hardness of attitude towards oneself, which makes possible compassion, and forgiveness towards others.