Srimad Bhagavatam Canto 11, Chapter 18, Text 47

SB 11.18.47

varnasramavatam dharma
 esa acara-laksanah
sa eva mad-bhakti-yuto
 nihsreyasa-karah parah
 
Translation: 
 
Those who are followers of this varnasrama system accept religious principles according to authorized traditions of proper conduct. When such varnasrama duties are dedicated to Me in loving service, they award the supreme perfection of life.
 
Purport: 
 
According to the varnasrama system, the members of different orders and statuses of life have many traditional duties, such as worshiping the forefathers to save them from possible sinful reactions. All such Vedic rituals, sacrifices, austerities and so forth should be offered to the lotus feet of Lord Sri Krsna. They then become the transcendental means for going back home, back to Godhead. In other words, Krsna consciousness, or loving service to Lord Sri Krsna, is the sum and substance of progressive human life.
Srimad Bhagavatam Canto 11, Chapter 18, Text 46
Srimad Bhagavatam Canto 11, Chapter 18, Text 48