100       Rāja-vidyā: The King of Knowledge
Kṛṣṇa consciousness. We should all engage in spreading the science of Kṛṣṇa for the benefit of the whole world. Lord Caitanya Mahāprabhu came with this mission of teaching Kṛṣṇa consciousness, and He said that regardless of one's position, if he teaches Kṛṣṇa consciousness he is to be considered a spiritual master. Both  Bhagavad-gītā  and  Śrīmad-Bhāgavatam  are filled with information on how to become Kṛṣṇa conscious. Lord Caitanya Mahāprabhu selected these two books and requested that people in all corners of the world spread this science of Kṛṣṇa in every town and village. Lord Caitanya Mahāprabhu was Kṛṣṇa Himself, and we should take this to be Kṛṣṇa's indication of our proper work. But we should be careful to present  Bhagavad-gītā  as it is, without personal interpretation or motivation. Some people present interpretations of  Bhagavad-gītā , but we should present the words as they are spoken by Śrī Kṛṣṇa.
One who works for Kṛṣṇa may appear to be working like anyone else in the material world, but this is not the case. Arjuna may have fought just like an ordinary military man, but because he fought in Kṛṣṇa consciousness, he was free from the entanglement of his activities. In this way, his work, although appearing material, was not material at all. Any action sanctioned by Kṛṣṇa—regardless of what it may be—has no reaction. Fighting may not be a very nice thing, but sometimes, as in the case of the battle of Kurukṣetra, it is an absolute necessity. On the other hand, we may perform work which may be very altruistic or humanitarian in the opinion