Liberation from material bondage is, therefore, a by-product of devotional service. Attainment of spiritual knowledge is not sufficient to insure liberation. Such knowledge must be overcoated with devotional service so that ultimately the devotional service alone predominates. Then liberation is made possible. Even the reactionary work of the fruitive workers can lead one to liberation when it is overcoated with devotional service. Karma overcoated with devotional service is called karma-yoga. Similarly, empirical knowledge overcoated with devotional service is called jnana-yoga. But pure bhakti-yoga is independent of such karma and jnana because it alone can not only endow one with liberation from conditional life but also award one the transcendental loving service of the Lord.

Therefore, any sensible man who is above the average man with a poor fund of knowledge must constantly remember the Personality of Godhead by hearing about Him, by glorifying Him, by remembering Him and by worshiping Him always, without cessation. That is the perfect way of devotional service. The Gosvamis of Vrndavana, who were authorized by Sri Caitanya Mahaprabhu to preach the bhakti cult, rigidly followed this rule and made immense literatures of transcendental science for our benefit. They have chalked out ways for all classes of men in terms of the different castes and orders of life in pursuance of the teachings of Srimad-Bhagavatam and similar other authoritative scriptures.