There is a statement in the Brahma-saṁhitā: Just ride on the airplane which runs at the speed of mind. Our material airplanes can run two thousand miles per hour, but what is the speed of mind? You are sitting at home, you immediately think of India—say, ten thousand miles away—and at once it is in your home. Your mind has gone there. The mind-speed is so swift. Therefore it is stated, "If you travel at this speed for millions of years, you'll find that the spiritual sky is unlimited." It is not possible even to approach it. Therefore, the Vedic injunction is that one must approach—the word "compulsory" is used—a bona fide spiritual master, a guru. And what is the qualification of a spiritual master? He is one who has rightly heard the Vedic message from the right source. And he must practically be firmly established in Brahman. These are the two qualities he must have. Otherwise he is not bona fide.
This Kṛṣṇa consciousness movement is completely authorized from Vedic principles. In the Bhagavad-gītā Kṛṣṇa says, "The actual aim of Vedic research is to find out Kṛṣṇa." In the Brahma-saṁhitā it is also stated, "Kṛṣṇa, Govinda, has innumerable forms, but they are all one." They are not like our forms, which are fallible. His form is infallible. My form has a beginning, but His form has no beginning. It is ananta. And His form—so many multiforms—has no end. My form is sitting here and not in my apartment. You are sitting there and not in your apartment. But Kṛṣṇa can be everywhere at one time. He can sit down in Goloka Vṛndāvana, and at the same time He is everywhere, all-pervading. He is original, the oldest, but whenever you look at a picture of Kṛṣṇa you'll find a young boy fifteen or twenty years old. You will never find an old man. You have seen pictures of Kṛṣṇa as a charioteer from the Bhagavad-gītā. At that time He was not less than one hundred years old. He had great-grandchildren, but He looked just like a boy. Kṛṣṇa, God, never becomes old. That is His supreme power. And if you want to search out Kṛṣṇa by studying the Vedic literature, then you will be baffled. It may be possible, but it is very difficult. But you can very easily learn about Him from His devotee. His devotee can deliver Him to you: "Here He is, take Him." That is the potency of Kṛṣṇa's devotees.
Originally there was only one Veda, and there was no necessity of reading it. People were so intelligent and had such sharp memories that by once hearing from the lips of the spiritual master they would understand. They would immediately grasp the whole purport. But five thousand years ago Vyāsadeva put the Vedas in writing for the people in this age, Kali-yuga. He knew that eventually the people would be short-lived, their memories would be very poor, and their intelligence would not be very sharp. "Therefore, let me teach this Vedic knowledge in writing." He divided the Vedas into four: Ṛg, Sāma, Atharva and Yajur. Then he gave the charge of these Vedas to his different disciples. He then thought of the less intelligent class of men—strī, śūdra and dvija-bandhu. He considered the woman class and śūdra class (worker class) and dvija-bandhu. Dvija-bandhu refers to those who are born in a high family but who are not properly qualified. A man who is born in the family of a brāhmaṇa but is not qualified as a brāhmaṇa is called dvija-bandhu. For these persons he compiled the Mahābhārata, called the history of India, and the eighteen Purāṇas. These are all part of the Vedic literature: the Purāṇas, the Mahābhārata, the four Vedas and the Upaniṣads. The Upaniṣads are part of the Vedas. Then Vyāsadeva summarized all Vedic knowledge for scholars and philosophers in what is called the Vedānta-sūtra. This is the last word of the Vedas.