All the different sorts of impressions have one source, ignorance. We have first to learn what ignorance is. All of us think, “I am the body, and not the Self, the pure, the effulgent, the ever blissful,” and that is ignorance. We think of man, and see man as body. This is the great delusion. The seer is really the Self, the pure one, the ever holy, the infinite, the immortal. This is the Self of man. And what are the instruments? The Chitta or mind-stuff, the Buddhi or determinative faculty, the Manas or mind, and the Indriyas or sense-organs. These are the instruments for him to see the external world, and the identification of the Self with the instruments is what is called the ignorance of egoism. We say, “I am the mind,” “I am thought,” “I am angry,” or “I am happy”. How can we be angry and how can we hate? We should identify ourselves with the Self that cannot change. If It is unchangeable, how can It be one moment happy, and one moment unhappy? It is formless, infinite, omnipresent. What can change It ? It is beyond all law. What can affect it? Nothing in the universe can produce an effect on It. Yet through ignorance, we identify ourselves with the mind-stuff, and think we feel pleasure or pain.