"If you cannot purify yourself by any endeavor whatsoever, then just go sit with the Vaisnavas and you will achieve all auspiciousness."
(Sri Ramanujacarya - (Quoted in Srila Bhaktivinoda Thakura's Bhaktyaloka))
"Material enjoyments are full of poison, but you consider them pleasing.
Do not think of them as a source of happiness, but understand them as
distress. Be absorbed in full thought of Govinda, associate with His
devotees, and conclude that devotional service is the goal of life."
(Srila Narottama Dasa Thakura - Sri Prema Bhakti Candrika)
"People may say that there are many qualified people in this world with tasteful pastimes and jewellike opulences, but the best of beautiful sages have ascertained that Krsna, the prince of Vraja, is the only source of all this."
(Krsnadasa Kaviraja Gosvami - Govinda-lilamrta)
"I continually glorified the Lord and meditated upon Him for millions of years, and at last I was able to understand the transcendental form of the Lord as Sri Krsna, in the dress of a cowherd boy."
(Lord Brahma - Sri Gopala-tapani Upanisad 1.27)
"It is true that by practicing restraint of the senses by the yoga system one can get relief from the disturbances of desire and lust, but this is not sufficient to give satisfaction for the soul, for this [satisfaction] is derived from devotional service to the Personality of Godhead."
(Sri Narada Muni - Srimad-Bhagavatam 1.6.35)
"See how universal is the religion of Bhagavat [Srimad-Bhagavatam]. It is not intended for a certain class of Hindus alone, but it is a gift to the mankind at large in whatever country born, in whatever society bred, and of whatever culture produced. In short, Vaisnavism is the Absolute Love binding all men together into the Infinite, Unconditioned, and Absolute God (Krsna)."
(Srila Bhaktivinoda Thakura - The Bhagavat: Its Philosophy, Its Religion, Its Ethics & Its Theology)
"If one sincerely searches for spiritual salvation, then Krsna, being situated in everyone's heart, gives him the intelligence to find a suitable spiritual master. By the grace of a spiritual master . . . , one gets the proper instruction and advances in his spiritual life."
(His Divine Grace A. C. Bhaktivedanta Swami Prabhupada - Srimad-Bhagavatam 3.20.4, Purport)