CC Ādi 17.30

sadā nāma la-iba, yathā-lābhete santoṣa
eita ācāra kare bhakti-dharma-poṣa
Synonyms: 
sadā — always; nāma — the holy name; la-iba — one should chant; yathā — inasmuch as; lābhete — gains; santoṣa — satisfaction; eita — this; ācāra — behavior; kare — does; bhakti-dharma — of devotional service; poṣa — maintenance.
Translation: 
“One should strictly follow the principle of always chanting the holy name, and one should be satisfied with whatever he gets easily. Such devotional behavior solidly maintains one’s devotional service.