The Self never undergoes change; the intellect never possesses consciousness. But when one sees all this world, he is deluded into thinking, "I am the seer, I am the knower." Mistaking one's Self for the individual entity, one is overcome with fear. If one knows oneself not as the individual but as the supreme Self, one becomes free from fear.

(Shankara(Adi Shankaracharya))