byŚrīla Bhaktivedānta Vāmana Gosvāmī Mahārāja

Even if you have nothing, no wealth, no education or intelligence, as long as you have your mind and your life, it will do [to allow you to serve]. The inclination to serve (sevā-vṛtti) does not depend on an exchange of any material object....

by Śrīla Bhaktivedānta Vāmana Gosvāmī Mahārāja

When Śrī Gurupādpadma was residing at the establishment of his guru – Śrīla Prabhupāda Sarasvatī Ṭhākura – (guru-graha), several heretics also lived there. As guru-bhogīs they enjoyed the facilities provided by their guru [Śrīla Prabhupāda], and as guru-tyāgīs they did not pay heed to the life and precepts of their śrī guru....

by Śrīla Bhaktisiddhanta Sarasvatī Ṭhākura Prabhupāda

Do not slacken your endeavours to chant the holy names just because material thoughts arise in your mind while you are chanting....