Vedic Thoughts
A diseased person needs both proper medicine and a proper diet, and therefore the Krsna consciousness movement supplies materially stricken people with the medicine of the chanting of the holy name, or the Hare Krsna maha-mantra, and the diet of prasada. There are many hospitals and medical clinics to cure bodily diseases, but there are no such hospitals to cure the material disease of the spirit soul. The centers of the Krsna consciousness movement are the only established hospitals that can cure man of birth, death, old age, and disease.
His Divine Grace A. C. Bhaktivedanta Swami Prabhupada Sri Caitanya-caritamrta, Adi-lila 10.51, Purport
A person who has a tongue but does not glorify glorious Sri Krsna is a fool. Even if he somehow approaches the staircase to liberation, he cannot climb it.
Sri Narada Muni, Garga-samhita 1.2.1
The soul is atomic in size and can be perceived by perfect intelligence. This atomic soul is floating in the five kinds of air [prana, apana, vyana, samana, and udana], is situated within the heart, and spreads its influence all over the body of the embodied living entities. When the soul is purified from the contamination of the five kinds of material air, its spiritual influence is exhibited.
Mundaka Upanisad 3.1.9
My dear Lord, now I have complete experience concerning the worldly opulence, mystic power, longevity, and other material pleasures enjoyed by all living entities, from Lord Brahma down to the ant. As powerful time, You destroy them all. Therefore, because of my experience, I do not wish to possess them. My dear Lord, I request You to place me in touch with Your pure devotee and let me serve him as a sincere servant.
Sri Prahlada Maharaja, Srimad-Bhagavatam 7.9.24
To the degree that one's heart is polluted with sins, it cannot place its faith in the Vedic scriptures or the bona fide spiritual master. By hearing the Vedic scriptures in the association of saintly devotees, love for the Lord is manifest. That is the great result of having performed many pious deeds in many previous births.
Brahma-vaivarta Purana (Quoted in Jiva Gosvami's Bhakti-sandarbha 1.1.5-6)
A person who is always engaged in meditation on the sweet pastimes and wonderful activities of the Lord surely becomes freed from all material contamination.
Padma Purana (Quoted in Rupa Gosvami's Bhakti-rasamrta-sindhu)