One who has experienced his own true identity understands that all things exist as paraphernalia for giving ecstatic pleasure to the Supreme Lord.

Srila Bhaktisiddhanta Sarasvati Thakura
Commentary on Srimad-Bhagavatam 11.2.41

One who has unflinching devotion for the Personality of Godhead has all the good qualities of the demigods. But one who is not a devotee of the Lord has only material qualifications that are of little value.

Prahlada Maharaja
Srimad-Bhagavatam 5.18.12

O my Lord [Krsna], persons who smell the aroma of Your lotus feet, carried by the air of Vedic sound through the holes of the ears, accept Your devotional service. For them You are never separated from the lotus of their hearts.

Lord Brahma
Srimad-Bhagavatam 3.9.5

The materialist thinks that persons engaged in Krsna consciousness are crazy fellows wasting time by chanting Hare Krsna, but actually he does not know that he himself is in the darkest region of craziness because of accepting his body as permanent.

His Divine Grace A.C. Bhaktivedanta Swami Prabhupada
Srimad-Bhagavatam 3.30.3, purport

How can the fire of material suffering continue to burn the hearts of those who worship the Supreme Lord? The Lord's lotus feet have performed innumerable heroic deeds, and the beautiful nails on His toes resemble valuable jewels. The effulgence emanating from those nails resembles cooling moonshine, for it instantly relieves the suffering within the heart of the pure devotee, just as the appearance of the moon's cooling light relieves the burning heat of the sun.

Sri Havir Rsi
Srimad-Bhagavatam 11.2.54

The Absolute Truth is Sri Krsna, and loving devotion to Sri Krsna exhibited in pure love is achieved through congregational chanting of the holy name, which is the essence of all bliss.

Srila Krsnadasa Kaviraja Gosvami
Sri Caitanya-caritamrta, Adi-lila 1.94

Saintly persons, who are friends to all living entities, have a peaceful consciousness. They have controlled their senses and minds, and they easily attain the path of liberation, the path back to Godhead. Being unfortunate and attached to the miserable material condition, a materialistic person cannot associate with them.

Sukadeva Gosvami
Srimad-Bhagavatam 5.14.39