When the Spirit is invoked, it acts miraculously. How is it done? The tradition has several methods of which Japa is the most well known method. Mantras are powerful, especially when chanted according to the stipulation. OM is the most powerful mantra. It is called Sabda Brahman. The Immutable Spirit moves into creation becoming the mutable Brahman. It does so in three stages. The sound OM issues at the third stage when creation begins. Each line of tradition may resort to a different method. One sect requires the repetition of OM 1 1/2 crores of times.