When an intelligent person engages constantly in worshiping Me through loving devotional service as described by Me, his heart becomes firmly situated in Me. Thus all material desires within the heart are destroyed.- Lord Sri Krishna Srimad-Bhagavatam 11.20.29
Because a devotee of Lord Krishna is desireless, he is peaceful. Fruitive workers desire material enjoyment, jnanis desire liberation, and yogis desire material opulence; therefore they are all lusty and cannot be peaceful.- Sri Caitanya Mahaprabhu, Sri Caitanya-caritamrta, Madhya-lila 19.149
For a person devoid of devotional service, birth in a great family or nation, knowledge of revealed scripture, performance of austerities and penance, and chanting of Vedic mantras are all like ornaments on a dead body. Such ornaments simply serve the concocted pleasures of the general populace. – Hari-bhakti-sudhodaya 3.12
Do not stay in illusion; go to the eternal reality. Do not stay in darkness; go to the light. Do not keep taking material bodies; become immortal!- Brhad-aranyaka Upanisad 1.3.28
One who engages in the transcendental service of the Lord in body, mind, and word is to be considered liberated in all conditions of material existence.- Srila Rupa Goswami Bhakti-rasamrta-sindhu 1.2.187
When a living entity is conditioned by material nature, he is exactly like a person haunted by a ghost.- Jagadananda Pannita Prema, Vivarta 1
Without the unconditional mercy of the Lord’s most beloved friends, a devotee’s loving service can never succeed or bear fruit.- Sri Hanuman Brhad-Bhagavatamrta 1.4.88