prabhupada
Adi 7.48 : PURPORT :
In the paramparā system, the instructions taken from the bonafide spiritual master must also be based on revealed Vedic scriptures. One who is in the line of disciplic succession cannot manufacture his own way of behavior. There are many so-called followers of the Vaiṣṇava cult in the line of Caitanya Mahāprabhu who do not scrupulously follow the conclusions of the śāstras, and therefore they are considered to be apa-sampradāya, which means "outside of the sampradāya." Some of these groups are known as āula, bāula,kartābhajā, neḍā, daraveśa, sāṅi sahajiyā, sakhībhekī,smārta, jata-gosāñi, ativāḍī, cūḍādhārī andgaurāṅga-nāgarī. In order to follow strictly the disciplic succession of Lord Caitanya Mahāprabhu, one should not associate with these apasampradāya communities.

Madhya1.271 : PURPORT :
ŚrīCaitanya Mahāprabhu warned all His followers not to become independent or impudent. Unfortunately, after the disappearance of Lord Caitanya Mahāprabhu, many apa-sampradāyas (so-calledfollowers) invented many ways not approved by the ācāryas.Bhaktivinoda Ṭhākura has described them as the āula, bāula,kartābhajā, neḍā, daraveśa, sāni sahajiyā, sakhībhekī,smārta, jāta-gosāñi, ativāḍī, cūḍādhārī andgaurāṅga-nāgarī.

Madhya 8.83 : PURPORT :

sruti-smrti-puranadi- pancaratra-vidhim vinaaikantiki harer bhaktir utpatayaiva kalpate :

He clearly mentions in this verse that one must refer to the Vedic literature and other, supplementary literatures and follow the conclusion of the Vedas. An invented devotional attitude simply creates disturbances in the transcendental realm. If a person overly addicted to family life takes to Śrīmad-Bhāgavatam or Kṛṣṇa consciousness to earn a livelihood, his activity is certainly offensive. One should not become a caste guru and sell mantras for the benefit of mundane customers, nor should one make disciples for alivelihood. All these activities are offensive. One should not make a livelihood by forming a professional band to carry out congregational chanting, nor should one perform devotional service when one is attached to mundane society, friendship and love. Nor should one be dependent on so-called social etiquette. All of this is mental speculation. None of these things can be compared to unalloyed devotional service. No one can compare unalloyed devotional service, Kṛṣṇa consciousness, to mundane activities. There are many unauthorized parties pretending to belong to the ŚrīCaitanya cult, and some are known as āula, bāula, kartābhajā,neḍā, daraveśa, sāṅi, sakhībhekī, smārta, jāta-gosāñi,ativāḍi, cūḍādhārī and gaurāṅga-nāgari.

Adi-lila1.3 — Mayapur, March 27, 1975 : 
Utpātā,simply disturbance. Yata mat tata patha: "I can manufacturemy own way." This rascaldom has been condemned by Śrīla RūpaGosvāmī. He says that harer bhaktiḥ… You will find manyso-called bhaktas crying, falling down on the ground. But immediatelyafter, he is smoking bidi. So why this is going on? Because they donot follow the injunction of Śrīla Rūpa Gosvāmī. Chanting,dancing very loudly, and after the performance is finished — I haveseen it — "Can you give me a bidi?" You see? "Mythroat is now dried up." So this is utpātā. Śrīla RūpaGosvāmī has described this kind of so-called devotional attitude issimply disturbance. They imitate. Imitate. Therefore ŚrīlaBhaktivinoda Ṭhākura has condemned. There are so manyapa-sampradāya going on in the name of Caitanya Mahāprabhu'sdevotee.

Who are they? Āula, bāula, kartābhajā, neḍā,daraveśa, sāṅi, sahajiyā, sakhībhekī, smārta, jata-gosāñi.Then ativāḍī, cūḍādhārī, gaurāṅga-nāgarī, tota kahe eitāra saṅga nāhi kori: Tota Bābājī, he says, "I do notassociate with these classes of men." So after disappearance of Śrī Caitanya Mahāprabhu, so many apa-sampradāya sprang up. So we should be very much careful that… Sampradāya means who are carefully following the Vedic principle. Therefore Kavirāja Gosvāmī, although asserting the truth, he is prepared to give Vedic evidences. Now he has begun. (More…)

LosAngeles, February 7, 1969 : 
In this way there was, Caitanya's Mahāprabhu's time, this Kṛṣṇa consciousness movement was going nicely, very. And after Him, there was six Gosvāmīs. They also managed. Then, as it is the rule of this material world that you start something very good but in duecourse of time the things deteriorate, so this Vaiṣṇava, Kṛṣṇa consciousness movement, also deteriorated in due course of time. Say, after the disappearance of the Gosvāmīns, about 250 years after, the things became most ridiculous. The so-called devotees… Their representatives still are continuing. They are called prākṛta-sahajiyā. Prākṛta-sahajiyā means taking things very easily. They thought that Rādhā-Kṛṣṇa is just like aboy and girl's lusty affairs. And in this way they took it that sex life as religion. Even Vivekananda, he also criticized,"Vaiṣṇavism is sex religion." So the things deteriorated in such a way that… And similarly, as Advaita Prabhuwas afflicted, similarly, Bhaktivinoda Ṭhākura… He was at that time a householder, government officer and magistrate. He felt very much: "Oh, Lord Caitanya's movement is so… People… As soon as one will see that he belongs to the Caitanya sampradāya, he'll deride, 'Oh, these are all rascals, simply taking sex pleasures.That's all.' " There were thirteen pseudo Vaiṣṇavas,thirteen sects: Āula, Bāula, Karttābhajā, Neḍā, Daraveṣa,Sāṅi, Sahajiyā, Sakhībhekī. Sāṅi community… You have heard that in London there is a Sāṅi community. Sāṅi Hinducenter you have heard from Mukunda? The Sāṅi is there still.So there are thirteen pseudo pretenders belonging to the Caitanya-sampradāya. They are called first Āula, Bāula,Karttābhajā, Neḍā, Daraveṣa, Sāṅi, Sakhībhekī,Gaurāṅga-nagarī, Cūḍādhārī, Ativāḍī, and Smārta,Jāta-gosāñi. Like that, thirteen. (More…)

January24, 1977, Bhuvanesvara : 
Prabhupāda:Sakhībekhī. There are so many apasampradāyas, thirteen at least in the counting by Bhaktivinoda Ṭhākura: āula, bāulakartābhajā, neḍā, daraveśa, sāṅi sahajiyā, sakhībekhī.This sakhībekhī. Smārta, jāta-gosāñi, ativāḍī, cūḍādhārī,gaurāṅga-nāgarī. These thirteen, fourteen apasampradāyas. Theyare passing as Caitanya Mahāprabhu's sampradāya. But they're theworst, rejected. The sakhībekhī, dressing like…. To cheat Kṛṣṇa. Kṛṣṇa is after the gopīs, so they have dressed like gopī, and Kṛṣṇa does not know that he's a rascal man.(laughter) Just see. This is their intelligence, to…. "I have become a sakhī. Kṛṣṇa will embrace me and kiss me." So Kṛṣṇa is so fool. (laughs) These rascals are doing that.Sakhībhekhī. There was a Lalitā-sakhi in Navadvīpa. All women surrounding him. Somebody is dressing him with red, what is called? 

GorakhpurFeb 16 1971
Soas soon as you approach the Deity or the name, you should know fullywell that Krsna is present. Krsna is… Therefore we should worshipthe Deity with great attention, as much as Krsna is present. Andsimilarly, we should worship the holy name with great attention. Weshould not be inattentive. 

SupposeKrsna personally comes, personally He is here. Suppose personally, asyou think of personally, personally comes. If you do not become respectful, is that all right? No. You should be very much respectful. Even a respectable person, ordinary person, a big man ora rich man or a king comes,we become so much respectful. And what about Krsna when He's present as arcā-mūrti or as the holy name? These are the realization poi ntof view: Krsna, His name, His form, His quality, His pastimes. When you hear about Kṛṣṇa, that is also Kṛṣṇa. Actually, when you are reading Krsna book, Krsna is fighting with demons, that is also His pastime. So Kṛṣṇa is present. So you should be very attentive and worship this hearing. Unless we come to this point, there is lack of realization what is Krsna. 

Vrndavana,India August 1967 Letter to: Devotee & Hamsaduta

"Onewho understands and appreciates the disciplic succession is certainly advanced, and we should always be very careful to give full respectto those who have so carefully handled this Divine Fruit of transcendental knowledge before us. Even a slight change will spoil it. That is why I have always been so careful to give you only those things which I have heard from my Guru Maharaja.

Jan 24 1977 Bhuvanesvara
Prabhupāda: My Guru Mahārāja used to say, "When our men will be sahajiyā,he will be more dangerous."
Satsvarūpa:Our own men.

Prabhupāda: Bhaktisiddhānta Sarasvatī Ṭhākura, he said that "When our men will be sahajiyā,oh, they'll be more dangerous." So our men are becoming, some of them, sahajiyās. This very word he said, that"When our men will be sahajiyās he'll be more dangerous."

Jan 4 1973 Bombay
Thegreatest danger to our movement will come when we manufacture and create our own process for worshiping the deities.So don't ask any more new questions, whatever is going on, follow it just to the exact standard as I have given you, that's all 

Feb25 1977 Mayapur
Rāmeśvara: Just like this Alice Coltrane. She has done her small part. She made this record album with Govinda Jaya Jaya and Hare Kṛṣṇa.

Prabhupāda: That is… That will be a good thing. But when he (she) does it properly it will be more effective, because there is… If one does not chant in the process, then gradually it degrades. The offense will increase.There is chance.