The Lord lives in the spiritual world in His original personality, and a devotee who follows the instructions of the Lord approaches Him ( mam eti). As a spiritual person, such a devotee returns to the Personality of Godhead and plays and dances with Him. That is the ultimate goal of life.
His Divine Grace A. C. Bhaktivedanta Swami Prabhupada
Srimad-Bhagavatam 8.24.51, Purport

When one’s peaceful consciousness, strengthened by the mode of goodness, is fixed on the Personality of Godhead, one achieves religiosity, knowledge, detachment, and opulence.
Lord Sri Krishna
Srimad-Bhagavatam 11.19.25

When Hari [Krishna], the Lord of all demigods and heavenly residents, is duly worshiped by means of maha-mantras composed of His holy names, the ghostlike sins can no longer exist.
Padma Purana, Svarga-khanda 50.6

I am drowning in the ocean of birth and death. The fish of my mind is trapped in the horrible narrow well of repeated birth and death. O Lord, please rescue me from this horrible world of birth and death and give me loving devotion for Your lotus feet.
Lord Shiva
Brahma-vaivarta Purana 4.6.23

Sri-nama-sankirtana[the chanting of the holy names of the Lord] is the best sadhana [spiritual practice]. If other sadhanas help us inkrishna-sankirtana, then they deserve to be called sadhana; otherwise they are simply impediments tosadhana. Sri-krishna-nama-sankirtana is the emperor of sadhanas. It is the only infallible sadhana capable of bringing us to siddhi [spiritual perfection].
Srila Bhaktisiddhanta Sarasvati Thakura
Sri Srila Prabhupader Upadeshamrita, p. 274

One should associate with devotees, chant the holy name of the Lord, hear Srimad-Bhagavatam, reside at Mathura [Vrindavana], and worship the deity with faith and veneration. These five limbs of devotional service are the best of all. Even a slight performance of these five awakens love for Krishna.
Sri Chaitanya Mahaprabhu
Sri Chaitanya-charitamrita, Madhya-lila 22.128–129

One should not hear anything about Krishna from a non-Vaishnava. Milk touched by the lips of a serpent has poisonous effects; similarly, talks about Krishna given by a non-Vaishnava are also poisonous.
Srila Sanatana Goswami
Hari-bhakti-vilasa (quoting Padma Purana)