Sri Ramanujacarya states in the Vedartha-sangraha that devotional service is naturally very dear to the living entity. Indeed, it is life's goal. This devotional service is supreme knowledge, or Krsna consciousness, and it brings detachment from all material activity. In the transcendental position, a living being can perfectly acknowledge the superiority of serving the Supreme Lord. The devotees attain the Supreme Lord only by devotional service. Having such knowledge, one engages in his occupational duty, and that is called bhakti-yoga. By performing bhakti-yoga, one can rise to the platform of pure devotional service.

Srila Prabhupada; Cc Madhya 8.57 purport.