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Rāja-vidyā: The King of Knowledge
by and large, attached to pious philanthropic activities. They believe that religion means  yajña  (sacrifice),  dāna  (charity) and  tapas  (penance). One who engages in  tapasya  undertakes voluntarily very rigid regulations, such as  brahmacārī  students (celibates) or  sannyāsīs  (renounced order) undertake. Charity means voluntarily giving away one's material possessions. In the present age there is no sacrifice, but from historical literatures like the  Mahābhārata  we get information that kings performed sacrifices by distributing rubies, gold and silver.  Yajña  was primarily for kings, and charity, on a much smaller scale, was meant for householders. Those who actually believed in scriptures usually adopted some of these principles. But generally in this age people simply say that they belong to a religion but in actuality do nothing. Out of millions of such people, a very small number actually perform charity, sacrifice and penance. Caitanya Mahāprabhu further points out that out of millions who perform such religious principles all over the universe, only a few attain perfect knowledge and understand what they are .
Just knowing "I am not this body but am spirit soul" is not sufficient. We have to escape this entanglement of material nature. This is called  mukti , liberation. Out of many thousands of persons who are in self-knowledge as to what and who they are, only one or two may be actually liberated. And out of many thousands who are liberated, only one or two may understand what and who Kṛṣṇa is. So understanding Kṛṣṇa is not such an easy job. Thus in