One must render service to a Vaiṣṇava in order to get freed from sinful reactions, revive one's original Kṛṣṇa consciousness and be trained in how to love Kṛṣṇa.
(Srimad Bhagavatam---6:1:16---purport).

Although Lord Caitanya is Śrī Kṛṣṇa Himself, He appeared as a devotee to teach people in general how to love Kṛṣṇa.
(Sri caitanya Caritamrta---introduction).

If we learn how to love Kṛṣṇa, then it is very easy to immediately and simultaneously love every living being.
(Nectar of Devotion---preface).

Kṛṣṇa has no need of food, since He already possesses everything that be, yet He will accept the offering of one who desires to please Him in that way. The important element, in preparation, in serving and in offering, is to act with love for Kṛṣṇa.
(Bhagavad-Gita---9:26---purport).

Simply hearing submissively will free one’s heart from all the faults of ignorance, and thus one will achieve deep love for Kṛṣṇa. This is the path of peace.
(Sri caitanya Caritamrta---1:1:107---purport).

If one develops love for Kṛṣṇa by Kṛṣṇa conscious activities, one can know the Supreme Absolute Truth.
(Sri caitanya Caritamrta---1:1:35---purport).

Everyone has dormant love for Kṛṣṇa, and by culture and education that has to be awakened.
(Srimad Bhagavatam---4:29:50---purport).

When one chants the Hare Kṛṣṇa mantra without offenses, his dormant love for Kṛṣṇa immediately awakens.
(Srimad Bhagavatam----5:24:20---purport).

By chanting the holy name of the Lord, one dissolves his entanglement in material activities. After this, one becomes very much attracted to Kṛṣṇa, and thus dormant love for Kṛṣṇa is awakened.
(Sri caitanya Caritamrta---2:15:109---purport).

Instead of using the senses for sense gratification, the awakened devotee employs the senses in the transcendental loving service of the Lord. This is the process by which dormant love for Kṛṣṇa is awakened.
(Sri caitanya Caritamrta---2:22:105---purport).