Those who always worship Me with exclusive devotion, meditating on My transcendental form to them I carry what they lack, and I preserve what they have.

Lord Sri Krsna
Bhagavad-gita 9.22

Spirit and matter are completely contradictory things. All of us are spiritual entities. We cannot have perfect happiness, which is our birthright, however much we may meddle with the affairs of mundane things. Perfect happiness can be ours only when we are restored to our natural state of spiritual existence.

His Divine Grace A.C. Bhaktivedanta Swami Prabhupada
The Science of Self-Realization

A pure devotee of the Lord whose heart has once been cleansed by the process of devotional service never relinquishes the lotus feet of Lord Krsna, for they fully satisfy him, as a traveler is satisfied at home after a troubled journey.

Pariksit Maharaja
Srimad-Bhagavatam 2.8.6

A person who worships the demigods and gives up Lord Vasudeva [Krsna] is like a man who gives up the protection of his mother for the shelter of a witch.

Skanda Purana

The beauty of the cuckoo is her sweet voice. The beauty of a woman is her chastity. The beauty of an ugly person is his knowledge. And the beauty of an ascetic is his power of forgiveness.

Canakya Pandita

A person becomes purified simply by hearing the holy name of the Supreme Personality of Godhead, whose lotus feet create the holy places of pilgrimage. Therefore, what remains to be attained by those who have become His servants?

Durvasa Muni
Srimad-Bhagavatam 9.5.16

Even if one distributes ten million cows in charity during an eclipse of the sun, lives at the confluence of the Ganges and Yamuna for millions of years, or gives a mountain of gold in sacrifice to the brahmanas, he does not earn even one-hundredth part of the merit derived from chanting Hare Krsna.

Srila Rupa Gosvami
Laghu Bhagavatamrta