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THE SCIENCE OF SELF-REALIZATION
Mārjanam  means “cleanse,” and  darpaṇam  means “mirror.” The heart is a mirror. It is like a camera. Just as a camera takes all kinds of pictures of days and nights, so also our heart takes pictures and keeps them in an unconscious state. Psychologists know this. The heart takes so many pictures, and therefore it becomes covered. We do not know when it has begun, but it is a fact that because there is material contact, our real identity is covered. Therefore  ceto-darpaṇa-mārjanam : one has to cleanse his heart. There are different processes to cleanse the heart—the  jñāna  process, the yoga process, the meditation process, pious activities.  Karma  also cleanses the heart. If one acts very piously, his heart will gradually be cleansed. But although these processes are recommended for cleansing the heart, in this age they are all difficult. To follow the path of philosophical knowledge one must become a very learned scholar, one must read so many books, one must go to learned professors and scholars and speculate. One must search out a person who has seen the light. So these are all philosophical processes. Meditation is also a recommended process. One should question, “What am I?” Just consider: Am I this body? No. Am I this finger? No, this is  my  finger. If you contemplate your leg, you will see, “Oh, this is  my  leg.” Similarly, you will find everything to be “mine.” And where is that “I”? Everything is mine, but where is that “I”? When one is searching for that “I,” that is meditation. Real meditation means concentrating all the senses in that way. But that meditation process is very difficult. One must control the senses. The senses are dragging one outward, and one has to bring them inward for introspection. Therefore there are eight processes in the yoga system. The first is controlling the senses by regulative principles. Then sitting postures—that will help to concentrate the mind. If one sits leaning over, that will not help; if one sits up straight, that will help. Then controlling the breathing, then meditation, then  samādhi . But today these are very, very difficult processes. No one can immediately perform them. The so-called yoga processes are fragmental—only the sitting postures and a few breathing exercises are practiced. But that cannot bring one to the perfectional stage. The actual yoga process, although a recommended Vedic process, is very difficult in this age. Similarly one can try to get knowledge by the speculative philosophical process: “This is Brahman, this is not Brahman, so what is Brahman? What is spirit soul?” Such empiric philosophical discussion is also recommended, but it is useless in this age.
Therefore Caitanya Mahāprabhu—not only Caitanya Mahāprabhu but also the Vedic literature—says: