If we find that we are not spontaneously engaged in hearing and chanting and the other prescribed devotional activities, we should engage in one or more of them according to regulation. Thus every day without fail we chant Hare Krishna, worship the Deities, and hear or read Srimad-Bhagavatam. We actually regulate our lives around these prescribed activities in order to provoke thoughts and remembrances of Krishna, which is our goal.To think of Krishna is the essence of sadhana-bhakti, and to serve the guru by evoking such thoughts is the disciple’s essential duty.
LFD Vol 2, Pg 13, 4th Paragraph