They should preach the principles of Bh??gavatam by (a) karma-yoga, or doing everything for the satisfaction of the Lord, (b) regular hearing of the ??r??mad-Bh??gavatam from authorized persons or realized souls, (c) chanting of the glories of the Lord congregationally at home or at places of worship, (d) rendering all kinds of service to bh??gavatas engaged in preaching ??r??mad-Bh??gavatam and (