Experience of Kundalini

… Just before my attaining this state of mind, it had been revealed to me how the kundalini is aroused, how the lotuses of the different centres blossom forth, and how all this culminates in samādhi. This is a very secret experience. I saw a boy twenty-two or twenty-three years old, exactly resembling me, enter the Sushumna nerve and commune with the lotuses touching them with his tongue. He began with the centre at the anus and passed through the centres at the sexual organ, naval, and so on. The different lotuses of those centres-four-petalled, six-petalled, ten-petalled, and so forth-had been drooping at his touch they stood erect. 

When he reached the heart - I distinctly remember it - and communed with the lotuses there, touching it with his tongue, the twelve-petalled lotus, which was hanging head down, stood erect and open its petals. Then he came to the sixteen-petalled lotus in the throat and two petalled lotus in the forehead. And last of all, the thousand-petalled lotus in the head blossomed. Since then I have been in this state.   

- Sri Ramakrishna, Gospel of Sri Ramakrishna, P 830 (9 August 1885)