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THE SCIENCE OF SELF-REALIZATION
“Whenever I appear, My mission is to deliver the pious devotees and to annihilate the demons.” When Kṛṣṇa appeared, He had to kill many demons. If we see a picture of Viṣṇu we will notice that He has a conch-shell, lotus flower, club, and disc. These last two items are meant for killing demons. Within this world there are two classes of men—the demons and the devotees. The devotees are called demigods; they are almost like God because they have godly qualities. Those who are devotees are called godly persons, and those who are nondevotees, atheists, are called demons. So Kṛṣṇa, or God, comes with two missions: to give protection to the devotees and to destroy the demons. In this age Caitanya Mahāprabhu’s mission is also like that: to deliver the devotees and to annihilate the nondevotees, the demons. But in this age He has a different weapon. That weapon is not a club or disc or lethal weapon—His weapon is the  saṅkīrtana  movement. He killed the demonic mentality of the people by introducing the  saṅkīrtana  movement. That is the specific significance of Lord Caitanya. In this age people are already killing themselves. They have discovered atomic weapons with which to kill themselves, so there is no need for God to kill them. But He appeared to kill their demonic mentality. That is possible by this Kṛṣṇa consciousness movement.
Therefore, in the  Śrīmad-Bhāgavatam  it is said that this is the incarnation of God in this age. And who worships Him? The process is very simple. Just keep a picture of Lord Caitanya with His associates. Lord Caitanya is in the middle, accompanied by His principal associates—Nityānanda, Advaita, Gadādhara, and Śrīvāsa. One simply has to keep this picture. One can keep it anywhere. It is not that one has to come to us to see this picture. Anyone can have this picture in his home, chant this Hare Kṛṣṇa mantra, and thus worship Lord Caitanya. That is the simple method. But who will capture this simple method? Those who have good brains. Without much bother, if one simply keeps a picture of Śrī Caitanya Mahāprabhu at home and chants Hare Kṛṣṇa, then one will realize God. Anyone can adopt this simple method. There is no expenditure, there is no tax, nor is there any need to build a very big church or temple. Anyone, anywhere, can sit down on the road or beneath a tree and chant the Hare Kṛṣṇa mantra and worship God. Therefore it is a great opportunity. For example, in business or political life one sometimes finds a great opportunity. Those who are intelligent politicians take a good opportunity and make a success of it the first time it comes. Similarly, in this age, those who have sufficient intelligence take to this  saṅkīrtana  movement, and they advance very quickly.