An important man in the social order can be known by his mercy only. Similarly, one must be very dear to the Lord in order to know the Lord. The Lord is unlimited; no one can know Him completely, but one’s advancement in the transcendental loving service of the Lord can make one eligible to know the Lord.
His Divine Grace A. C. Bhaktivedanta Swami Prabhupada
Srimad-Bhagavatam 2.9.32, Purport

If we desire to chant Hari’s name offenselessly, then we should chant constantly. Constant chanting will vanquish our offenses.
Srila Bhaktisiddhanta Sarasvati Thakura
Amrita-vani, Instruction 95

Within this world, there are countless philosophies, which, although attempting to reach the Truth, are all incomplete and mutually contradictory because of their origin in bewilderment. All these philosophies find their perfection in krishna-bhakti, devotion to Sri Krishna.
Srila Bhaktivinoda Thakura
Sri Chaitanya-shikshamrita (opening words)

There is no substantial result in activities that are devoid of devotion to the Lord. Such nondevotional activities simply result in violence to others.
Sri Chaitanya Mahaprabhu
Sri Chaitanya-bhagavata, Madhya-khanda 1.240

When a devotee takes shelter at the lotus feet of the Supreme Personality of Godhead, he is completely cleansed of all misunderstanding or mental speculation, and he manifests renunciation. This is possible only when one is strengthened by practicing bhakti-yoga. Once having taken shelter at the root of the lotus feet of the Lord, a devotee never comes back to this material existence, which is full of the threefold miseries.
Prithu Maharaja
Srimad-Bhagavatam 4.21.32

O Maitreyi, one should see, hear, remember, and inquire about the Supreme Personality of Godhead.
Sage Yajnavalkya
Brihad-aranyaka Upanishad 2.4.5

The Supreme Lord [deva], the Absolute Truth, within whose hair holes all the universes have their abode [vasa], is called Vasudeva.
Brahma-vaivarta Purana
Sri-krishna-janma-khanda 87

All victory to You, Sri Krishna, who descended to Mathura, absorbed in the mission of spreading pure love for Your own self! You are the great reservoir of sweetness of every kind, and now You have revealed the magnitude of Your opulence and mercy.
Srila Sanatana Goswami
Sri Krishna-lila-stava 32

In the beginning, from the words of the Vedas Brahma expanded the names, forms, and activities of all creatures.
Vishnu Purana 1.5.63

The Vedas, Puranas, and poetic works instruct like a master, a friend, and a lover respectively. The Bhagavatam, however, teaches in all three ways.
Commentary on Mukta-phala (Cited by Sri Jiva Goswami in Sri Tattva-sandarbha)