The lotus has a kind of honey which is transcendentally relished by the devotees. They are like the bees who are always after the honey. Śrīla Rūpa Gosvāmī, the great devotee ācārya of the Gauḍīya-Vaiṣṇava-sampradāya, has sung a song about this lotus honey, comparing himself to the bee.
(Srimad Bhagavatam------1:11:26------purport).

Svādhyāyaḥ means "reading the authorized Vedic scriptures." Even if one is not Kṛṣṇa conscious and is practicing the yoga system, he must read standard Vedic literatures in order to understand. Performance of yoga alone is not sufficient. Narottama dāsa Ṭhākura, a great devotee and ācārya in the Gauḍīya Vaiṣṇava-sampradāya, says that all spiritual activities should be understood from three sources, namely saintly persons, standard scriptures and the spiritual master.
(Srimad Bhagavatam------3:28:4------purport).

Śrīla Narottama dāsa Ṭhākura, a great ācārya of the Gauḍīya Vaiṣṇava-sampradāya, advises us not to travel to different places of pilgrimage.
(Srimad Bhagavatam------4:6:25------purport).

One must be qualified with the symptoms of a brāhmaṇa, as the symptoms are described in the śāstras. In the disciplic succession of the Gauḍīya Vaiṣṇava sampradāya, there are two great ācāryas (Ṭhākura Narottama and Śyāmānanda Gosvāmī) who were not born in brāhmaṇa families but were accepted as spiritual masters by many brāhmaṇas of fame, including Gaṅgānārāyaṇa, Rāmakṛṣṇa, etc.
(Teachings of Lord Caitanya).

In the Middle Ages, after the disappearance of Lord Caitanya's great associate Lord Nityānanda, a class of priestly persons claimed to be the descendants of Nityānanda, calling themselves the gosvāmī caste. They further claimed that the practice and spreading of devotional service belonged only to their particular class, which was known as Nityānanda-vaṁśa. In this way, they exercised their artificial power for some time, until Śrīla Bhaktisiddhānta Sarasvatī Ṭhākura, the powerful ācārya of the Gauḍīya Vaiṣṇava sampradāya, completely smashed their idea.
(Nectar of Devotion).

Even Śaṅkarācārya, in his commentary on the Bhagavad-gītā, has accepted Nārāyaṇa as the transcendental Personality of Godhead who appeared as Kṛṣṇa, the son of Devakī and Vasudeva. Therefore this matter may be difficult to understand. But the Gauḍīya Vaiṣṇava-sampradāya, headed by Rūpa Gosvāmī, has established the principle of the Bhagavad-gītā that everything emanates from Kṛṣṇa, who says in the Bhagavad-gītā, ahaṁ sarvasya prabhavaḥ: [Bg. 10.8] “I am the original source of everything.”
(Sri Caitanya Caritamrta----- 1:5:132------purport).

Thinking “He [Śrī Advaita Ācārya] is a disciple of Śrī Mādhavendra Purī,” Lord Caitanya obeys Him, respecting Him as His spiritual master. Śrī Mādhavendra Purī is one of the ācāryas in the disciplic succession from Madhvācārya. Mādhavendra Purī had two principal disciples, Īśvara Purī and Śrī Advaita Prabhu. Therefore the Gauḍīya Vaiṣṇava-sampradāya is a disciplic succession from Madhvācārya. This fact has been accepted in the authorized books known as Gaura-gaṇoddeśa-dīpikā and Prameya-ratnāvalī, as well as by Gopāla Guru Gosvāmī.
(Sri Caitanya Caritamrta----- 1:6:40------translation and purport).

It is said that from this Mādhavācārya the sampradāya known in western India as the Vallabhācārya sampradāya has begun. Śrīla Gopāla Bhaṭṭa Gosvāmī, who is known as a smṛty-ācārya in the Gauḍīya-Vaiṣṇava-sampradāya, later accepted the tridaṇḍa-sannyāsa order from Tridaṇḍipāda Prabodhānanda Sarasvatī.
(Sri Caitanya Caritamrta----- 2:3:6------purport).

Sanātana Gosvāmī considered himself fallen, for in the association of such men, he also fell victim to material enjoyment. Having passed his life in that way, he considered that he had wasted his valuable time. This statement about how one can become fallen in this material world is made by the greatest authority in the Gauḍīya Vaiṣṇava-sampradāya.
(Sri Caitanya Caritamrta----- 2:20:99------purport).