In Vedic literature Krsna is the central point of attraction, and His service is our activity. To attain the platform of love of Krsna is life's ultimate goal. Therefore Krsna, Krsna's service, and love of Krsna are the three great riches of life.
Lord Sri Caitanya Mahaprabhu
Caitanya-caritamrta, Madhya-lila 20.143
A pure devotee of the Supreme Personality of Godhead is always thinking of how fallen, conditioned souls can be delivered. The Supreme Personality of Godhead, influenced by the devotees' attempt to deliver fallen souls, enlightens the people in general from within by His causeless mercy.
His Divine Grace A. C. Bhaktivedanta Swami Prabhupada
Srimad-Bhagavatam 4.29.46, purport
You cannot appreciate transcendental matters with the reasoning of the world. It is sheer nonsense to decry them with the measuring stick of your intellect.
Srila Bhaktisiddhanta Sarasvati Thakura
Discourse in Dacca, 1936
An intelligent person should reject all bad association and instead take up the association of saintly devotees, whose words cut off the excessive attachment of one's mind.
Lord Sri Krsna
The demigods are not perfectly endowed with transcendental qualities. Indeed, their opulences are limited, and therefore they worship the Supreme Personality of Godhead, the Absolute Truth, who is simultaneously free of all material qualities and completely endowed with all transcendental qualities, which exist in His personal body.
Just as the Ganga is the greatest of all rivers, Lord Acyuta [Krsna] the supreme among deities, and Lord Sambhu [Siva] the greatest of Vaisnavas, so Srimad-Bhagavatam is the greatest of all Puranas.
Srila Suta Gosvami
The foremost process of cheating is to desire to achieve liberation by merging in the Supreme, for this causes the permanent disappearance of loving service to Krsna.
Srila Krsnadasa Kaviraja Gosvami
Sri Caitanya-caritamrta, Adi-lila 1.92
No one can understand Krsna as He is by the blunt material senses. But He reveals Himself to the devotees, being pleased with them for their transcendental loving service unto Him.
Srila Rupa Gosvami