— Ramana Maharishi from Talks with Ramana

There are three states only, the waking, dream and sleep. Turiya is not a fourth one; it is what underlies these three. But people do not readily understand it. Therefore it is said that this is the fourth state and the only Reality. In fact it is not apart from anything, for it forms the substratum of all happenings; it is the only Truth; it is your very Being. The three states appear as fleeting phenomena on it and then sink into it alone. Therefore they are unreal.