He is becoming one, he does not see, they say; he is becoming one, he does not smell, they say; he is becoming one, he does not taste, they say, he is becoming one, he does not speak, they say; he is becoming one, he does not hear, they say; he is becoming one, he does not think, they say; he is becoming one, he does not touch, they say; he is becoming one, he does not know, they say. The point of his heart becomes lighted up and by that light the self departs either through the eye or through the head or through other apertures of the body. And when he thus departs, life departs after him. And when life thus departs, all the vital breaths depart after him. He becomes one with intelligence. What has intelligence departs with him. His knowledge and his work take hold of him as also his past experience.

(The Upanishads)