If a devotee follows the instructions of Sri Caitanya Mahaprabhu, he lives in the company of the Lord. Wherever he lives, he converts that place into Vrndavana and Navadvipa. This means that materialism cannot touch him. This is the secret of success for one advancing in Krsna consciousness.

His Divine Grace A.C. Bhaktivedanta Swami Prabhupada
Sri Caitanya-caritamrta, Madhya-lila 7.129, purport

Only an empowered personality can distribute the holy name of the Lord and enjoin all fallen souls to worship Krsna. By distributing the holy name of the Lord, he cleanses the hearts of the most fallen people; therefore he extinguishes the blazing fire of the material world. Not only that, he broadcasts the shining brightness of Krsna's effulgence throughout the world. Such an acarya, or spiritual master, should be considered nondifferent from Krsna that is, he should be considered the incarnation of Lord Krsna's potency.

Srila Bhaktisiddhanta Sarasvati Thakura
Quoted in Sri Caitanya-caritamrta, Madhya-lila 25.9, purport

Essential truth spoken concisely is true eloquence.

Srila Krsnadasa Kaviraja Gosvami
Sri Caitanya-caritamrta, Adi-lila 1.106

After many births and deaths, he who is actually in knowledge surrenders unto Me, knowing Me to be the cause of all causes and all that is. Such a great soul is very rare.

Lord Sri Krsna
Bhagavad-gita 7.19

Under no circumstances can the words of persons bewildered by the illusory energy of the Lord deviate the intelligence of those who are completely surrendered souls.

Sri Uddhava
Srimad-Bhagavatam 3.2.10

One who has no compassion for humanity in its suffering and does not sacrifice his impermanent body for the higher causes of religious principles or eternal glory is certainly pitied even by the immovable beings.

Sri Dadhici Rsi
Srimad-Bhagavatam 6.10.8

Men who are like dogs, hogs, camels, and asses praise those men who never listen to the transcendental pastimes of Lord Sri Krsna. the deliverer from evils.

Sri Saunaka Rsi
Srimad-Bhagavatam 2.3.19