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Unless kundalini is active, the deepest meditative states are not available to us. But to activate kundalini, Gurudeva tells us we must invoke the grace of Lord Ganesha and Lord Murugan. "Yoga is internalized worship which leads to union with God." Experience the inside of you in a profound way. This requires dispassion. The popular term "kriya yoga" usual refers to a form of pranayama, but the original kriya yoga is defined by Sage Patanajli as the practice of three of the niyamas: tapas, svadhyaya and Isvarapranidhana. To achieve samadhi we practice yoga, steady restraint of mental activities, austerity, meditation, detachment, self study and worship of God. Communion with the Ishta Devata, the chosen God is a key and also Gurudeva tells us: the Deity chooses you.
Master Course, Dancing with Siva, Lesson 39
Master Course, Merging with Siva, Lesson 5
Patanjali's Yoga Sutras