CC Madhya 20.139
‘abhidheya’ bali’ tāre sarva-śāstre gāya
As Lord Kṛṣṇa states in the Bhagavad-gītā (18.55).
bhaktyā mām abhijānāti yāvān yaś cāsmi tattvataḥ
tato māṁ tattvato jñātvā viśate tad-anantaram
“One can understand Me as I am, as the Supreme Personality of Godhead, only by devotional service. And when one is in full consciousness of Me by such devotion, he can enter into the kingdom of God.”
The aim of life is to get rid of the material conditioning and enter into spiritual existence. Although the śāstras prescribe different methods for different men, the Supreme Personality of Godhead says that one ultimately must accept the path of devotional service as the assured path of spiritual advancement. Devotional service to the Lord is the only process actually confirmed by the Lord. Sarva-dharmān parityajya mām ekaṁ śaraṇaṁ vraja (Bg. 18.66). One must become a devotee if one wants to return home, back to Godhead, and become eternally blissful.