Always remember: being parts and parcel, our duty is to serve the Supreme. The same example: the finger, hand, being part and parcel of body, is always engaged in the service of the whole. So these brahmanas, ksatriyas, vaisyas, sudras, they are also parts and parcels, the same position. Brahmana is the head, ksatriya is the arm, vaisyais the belly, and the sudras... But everything is required. If you want to keep up your body in sound condition of... Any part of the body is important. Comparatively, the head is most important. But other parts, you cannot say they are not important. But when there is competition, that "I am the most important. You are nothing," or "I am something. You are nothing," in this way we forget to serve the whole, and that becomes the cause of our falldown.
Lecture on Srimad-Bhagavatam 6.3.12-15, Gorakhpur, February 9, 1971