Śrīla Bhaktisiddhānta Sarasvatī Ṭhākura used to say, "If I could perfectly deliver even one soul back home, back to Godhead, I would think my mission—propagating Kṛṣṇa consciousness—to be successful."
(Srimad Bhagavatam----4:12:33----purport).

Among Vaiṣṇavas there may be some difference of opinion due to everyone's personal identity, but despite all personal differences, the cult of Kṛṣṇa consciousness must go on. We can see that under the instructions of Śrīla Bhaktivinoda Ṭhākura, Śrīla Bhaktisiddhānta Sarasvatī Gosvāmī Mahārāja began preaching the Kṛṣṇa consciousness movement in an organized way within the past hundred years. The disciples of Śrīla Bhaktisiddhānta Sarasvatī Gosvāmī Mahārāja are all Godbrothers, and although there are some differences of opinion, and although we are not acting conjointly, every one of us is spreading this Kṛṣṇa consciousness movement according to his own capacity and producing many disciples to spread it all over the world.
(Srimad Bhagavatam----4:28:31----purport).

The Kṛṣṇa consciousness movement has been introduced in the Western countries, but it is not possible for Westerners to go to the forest and practice the severe austerities which were ideally practiced by Pṛthu Mahārāja or Rūpa Gosvāmī. However, Westerners or anyone else can follow in the footsteps of Śrīla Bhaktisiddhānta Sarasvatī Ṭhākura by living in a temple, which is transcendental to residence in a forest, and to vow to accept kṛṣṇa-prasāda and nothing else, follow the regulative principles and chant sixteen rounds daily of the Hare Kṛṣṇa mantra. In this way, one's spiritual life will never be disturbed.
(Srimad Bhagavatam----4:23:5----purport).

Śrīla Bhaktisiddhānta Sarasvatī Ṭhākura never advised a neophyte devotee to go to a solitary place to engage in devotional service. Indeed, he has written a song in this connection:
duṣṭa mana! tumi kisera vaiṣṇava?
pratiṣṭhāra tare, nirjanera ghare,
tava hari-nāma kevala kaitava
"My dear mind, what kind of devotee are you? Simply for cheap adoration you sit in a solitary place and pretend to chant the Hare Kṛṣṇa mahā-mantra, but this is all cheating." Thus Bhaktisiddhānta Sarasvatī Ṭhākura advocated that every devotee, under the guidance of an expert spiritual master, preach the bhakti cult, Kṛṣṇa consciousness, all over the world.
(Srimad Bhagavatam----4:28:33----purport).

A total life in Kṛṣṇa consciousness saves one from material contamination. As stated by Bhaktisiddhānta Sarasvatī Gosvāmī Mahārāja:
kṛṣṇa-bhajane yāhā haya anukūla
viṣaya baliyā tyāge tāhā haya bhūla
If one is so expert that he can engage everything or dovetail everything in the service of the Lord, to give up the material world would be a great blunder. One should learn how to dovetail everything in the service of the Lord, for everything is connected to Kṛṣṇa. That is the real purpose of life and secret of success.
(Srimad Bhagavatam----4:30:19----purport).

Śrīla Rūpa Gosvāmī has stated:
prāpañcikatayā buddhyā
hari-sambandhi-vastunaḥ
mumukṣubhiḥ parityāgo
vairāgyaṁ phalgu kathyate
Everything, even that which is material, is connected with the Supreme Personality of Godhead. Therefore everything should be engaged in the service of the Lord. Śrīla BhaktisiddhāntaSarasvatī Ṭhākura translates this verse as follows:
hari-sevāya yāhā haya anukūla
viṣaya baliyā tāhāra tyāge haya bhula
"One should not give up anything connected with the Supreme Personality of Godhead, thinking it material or enjoyable for the material senses."
(Srimad Bhagavatam----5:16:3----purport).

Śrīla Bhaktisiddhānta Sarasvatī Ṭhākura accepted the sannyāsa-āśrama directly from the brahmacārī-āśrama. In other words, His Divine Grace BhaktisiddhāntaSarasvatī Ṭhākura did not think it compulsory to accept the gṛhastha-āśrama or vānaprastha-āśrama.
(Srimad Bhagavatam----7:12:13-14----purport).

In his Anubhāṣya, Śrī Bhaktisiddhānta Sarasvatī Ṭhākura, describing the truth about the Pañca-tattva, explains that we should understand that Lord Śrī Caitanya Mahāprabhu is the supreme predominator and that Nityānanda Prabhu and Advaita Prabhu are His subordinates but are also predominators. Lord Śrī Caitanya Mahāprabhu is the Supreme Lord, and Nityānanda Prabhu and Advaita Prabhu are manifestations of the Supreme Lord. All of Them are viṣṇu-tattva, the Supreme, and are therefore worshipable by the living entities.
(Sri Caitanya Caritamrta----1:7:15----purport).

In his Anubhāṣya, Śrī Bhaktisiddhānta Sarasvatī Gosvāmī says that the actual effect that will be visible as soon as one achieves transcendental knowledge is that he will immediately become free from the clutches of māyā and fully engage in the service of the Lord.
(Sri Caitanya Caritamrta----1:7:73----purport).

Śrīla Bhaktisiddhānta Sarasvatī Ṭhākura explains in his Anubhāṣya, “A person who has attracted the attention of the spiritual master by his sincere service likes to dance and chant with similarly developed Kṛṣṇa conscious devotees.
(Sri Caitanya Caritamrta----1:7:92----purport).

Those who are not advanced prefer to chant the Hare Kṛṣṇa mantra in a solitary place.” Such activities constitute, in the language of Śrīla Bhaktisiddhānta Sarasvatī Ṭhākura, a type of cheating process in the sense that they imitate the activities of exalted personalities like Haridāsa Ṭhākura.
(Sri Caitanya Caritamrta----1:7:92----purport).