Religious systems are meant to show the existence of God, who is then generally approached as the cosmic order-supplier. But Lord Sri Chaitanya Mahaprabhu’s transcendental mission is to distribute love of Godhead to everyone. Anyone who accepts God as the Supreme can take to the process of chanting Hare Krishna and become a lover of God. Therefore Lord Chaitanya is the most magnanimous. This munificent broadcasting of devotional service is possible only for Krishna Himself. Therefore Lord Chaitanya is Krishna.
His Divine Grace A. C. Bhaktivedanta Swami Prabhupada
Sri Chaitanya-charitamrita, Adi-lila 4.41, Purport

One is immediately freed from the clutches of maya if he seriously and sincerely says, “My dear Lord Krishna, although I have forgotten You for so many long years in the material world, today I am surrendering unto You. I am Your sincere and serious servant. Please engage me in Your service.”
Sri Chaitanya Mahaprabhu
Sri Chaitanya-charitamrita, Madhya-lila 22.33

A faithful man who is dedicated to transcendental knowledge and who subdues his senses is eligible to achieve such knowledge, and having achieved it he quickly attains the supreme spiritual peace. But ignorant and faithless persons who doubt the revealed scriptures do not attain God consciousness; they fall down. For the doubting soul there is happiness neither in this world nor in the next.
Lord Sri Krishna
Bhagavad-gita 4.39–40

When a man is sleeping, all his material assets – namely the vital energy, the senses for recording knowledge, the senses for working, the mind, and the intelligence – cannot arouse him. He can be aroused only when the Supersoul helps him. Therefore, through devotion, detachment, and advancement in spiritual knowledge acquired through concentrated devotional service, one should contemplate that Supersoul as present in this very body although simultaneously apart from it.
Lord Kapila
Srimad-Bhagavatam 3.26.71–72

The Lord has a form full of faultless qualities, which is independent. He is devoid of the qualities of lifeless, material bodies. All the parts of His body, such as hands, feet, head, and belly, are bliss alone.
Dhyana-bindu Upanishad
Quoted in Vishvanatha Chakravarti’s commentary on Srimad-Bhagavatam 1.1.1

O my dear Lord Hari [Krishna]! If a greatly fortunate soul somehow or other gets a chance to drink just one priceless nectar-drop sprayed from the ocean of love emanating from Your lotus feet, then all of his miseries are instantly repelled to a far distant place.
Srila Bhaktivinoda Thakura
Sri Gita-mala, Song 14