Always engage in devotional service with determination.
The Kingdom of Godhead is not a myth but it is situated far beyond the boundary of the material cosmos and one can know it by the process of devotional service only.
Meditation means stopping all nonsensical activities, at least for the time being. Devotional service, however, not only puts an end to all nonsensical mundane activities, but also engages one in meaningful devotional activities. — The Nectar of instruction, Text 02
Devotional Service should start at early age, and not during old age.