For the management of affairs, we require to divide. Because there are different classes of brain, so those who have very intellectual brain, they should become brahmanas. Those who are fit for management and protection, they should be trained as ksatriya. And those who are fit for producing food, taking care of the cows, they should be trained as vaisya. And the balance, they're all sudras. This is the division.
Varnasrama walk, Vrndavana, 12 March, 1974