Krishna is the Absolute Truth, the Supreme Personality of Godhead, and He is situated in His internal potency, which is known as svarüpa-sakti or atma-sakti, as described in Bhagavad-gita. He expands Himself in various multiple forms, and some of these are known as His personal forms and some as His separated forms. He thus enjoys Himself in all the spiritual planets, as well as in the material universes. – His Divine Grace A. C. Bhaktivedanta Swami Prabhupada, Teachings of Lord Caitanya, Chapter 10

A pure devotee who is fully accomplished in the science of devotional service will never instruct a foolish person to engage in fruitive activities for material enjoyment, not to speak of helping him in such activities. Such a devotee is like an experienced physician, who never encourages a patient to eat food injurious to his health, even if the patient desires it. – Lord Vishnu Srimad-Bhagavatam 6.9.50

To taste the fruit of devotional service at Goloka Vrindavana is the highest perfection of life, and in the presence of such perfection, the four material perfections religion, economic development, sense gratification, and liberation are very insignificant achievements.- Sri Caitanya Mahaprabhu Sri Caitanya-caritamrta, Madhya-lila 19.164

The soul’s material life, his experience of sense gratification, is actually false, O descendant of Dasarha, just like trees’ appearance of quivering when the trees are reflected in agitated water, or like the earth’s appearance of spinning due to one’s spinning his eyes around, or like the world of a fantasy or dream.- Lord Sri Krishna Srimad-Bhagavatam 11.22.54–55

Inattention will lead to the destruction of work. Want of wealth will lead to the destruction of discrimination. Begging will lead to the destruction of pride. And sinful activities will lead to the destruction of everything.- Canakya Pandita

The Lord’s transcendental form is the Absolute Truth, devoid of duality and of beginning, middle, or end. It is self-effulgent, eternal, and full of knowledge and bliss. Only through devotional service can one understand that form to be infallible.- Vasudeva Upanisad 6.5

A Vaishnava can see Lord Vishnu when his constitutional propensity for serving Krishna is awakened. A living entity who is devoid of the inclination for eternal service can never give up gross and subtle perception; therefore, due to the spirit of enjoyment, the conditioned soul cannot see his worshipable Lord Krishna.- Srila Bhaktisiddhanta Sarasvati Thakura Sri Caitanya-bhagavata, adi-khanda 5.148, Commentary