It is a qualification of the great thinkers to pick up the best even from the worst. It is said that the intelligent man should pick up nectar from a stock of poison, should accept gold even from a filthy place, should accept a good and qualified wife even from an obscure family and should accept a good lesson even from a man or from a teacher who comes from the untouchables. These are some of the ethical instructions for everyone in every place without exception. But a saint is far above the level of an ordinary man. He is always absorbed in glorifying the Supreme Lord because by broadcasting the holy name and fame of the Supreme Lord, the polluted atmosphere of the world will change, and as a result of propagating the transcendental literatures like Śrīmad-Bhāgavatam, people will become sane in their transactions.
(Srimad Bhagavatam-------1:5:11------purport).

The major portion of our monetary income, not less than fifty percent, must be spent to carry out the order of Lord Kṛṣṇa. Not only should we give the profit of our earning to this cause, but we must also arrange to preach this cult of devotion to others because that is also one of the orders of the Lord. The Lord definitely says that no one is more dear to Him than one who is always engaged in the preaching work of the Lord's name and fame all over the world. The scientific discoveries of the material world can also be equally engaged in carrying out His order. He wants the message of the Bhagavad-gītā to be preached amongst His devotees. It may not be so done amongst those who have no credit of austerities, charity, education, etc. Therefore, the attempt must go on to convert unwilling men to become His devotees. Lord Caitanya has taught a very simple method in this connection. He has taught the lesson for preaching the transcendental message through singing, dancing and refreshment. As such, fifty percent of our income may be spent for this purpose.
(Srimad Bhagavatam-------1:5:36------purport).

The Kṛṣṇa consciousness movement has spread all over the world within a very short time (within five years), and mundane people are very much astonished at this. However, by the grace of Lord Śrī Caitanya Mahāprabhu, we understand that everything is possible by the grace of Kṛṣṇa. Why does Kṛṣṇa have to take five years? In five days He can spread His name and fame all over the world like wildfire. Those who have faith in and devotion to Kṛṣṇa can understand that these things happen so wonderfully by the grace of Śrī Caitanya Mahāprabhu. We are simply the instruments. In the fierce Battle of Kurukṣetra, Arjuna was victorious within eighteen days simply because Kṛṣṇa's grace was on his side.
(Sri Caitanya Caritamrta--------2:4:79------purport).

If the preachers in our Kṛṣṇa consciousness movement are sincere devotees of Kṛṣṇa, Kṛṣṇa will always be with them because He is very kind and favorable to all His devotees. Just as Arjuna and Kṛṣṇa were victorious in the Battle of Kurukṣetra, this Kṛṣṇa consciousness movement will surely emerge victorious if we but remain sincere devotees of the Lord and serve the Lord according to the advice of the predecessors (the six Gosvāmīs and other devotees of the Lord). As Narottama dāsa Ṭhākura has stated: tāṅdera caraṇa sevi bhakta-sane vāsa, janame janame haya ei abhilāṣa. The Kṛṣṇa consciousness devotees must always desire to remain in the society of devotees. Bhakta-sane vāsa: they cannot go outside the Kṛṣṇa consciousness society or movement. Within the society we must try to serve the predecessors by preaching Caitanya Mahāprabhu's cult and spreading His name and fame all over the world. If we attempt this seriously within the society, it will be successfully done. There is no question of estimating how this will happen in the mundane sense. But without a doubt, it happens by the grace of Kṛṣṇa.
(Sri Caitanya Caritamrta--------2:4:79------purport).