CC Antya 20.58

kṛṣṇa — mora jīvana,  kṛṣṇa — mora prāṇa-dhana,
kṛṣṇa — mora prāṇera parāṇa
hṛdaya-upare dharoṅ,
  sevā kari’ sukhī karoṅ,
ei mora sadā rahe dhyāna
Synonyms: 
kṛṣṇa — Lord Kṛṣṇa; mora jīvana — My life and soul; kṛṣṇa — Lord Kṛṣṇa; mora prāṇa-dhana — the wealth of My life; kṛṣṇa — Lord Kṛṣṇa; mora prāṇera parāṇa — the life of My life; hṛdaya-upare — on My heart; dharoṅ — I hold; sevā kari’ — serving; sukhī karoṅ — I make happy; ei — this; mora — My; sadā — always; rahe — remains; dhyāna — meditation.
Translation: 
“Kṛṣṇa is My life and soul. Kṛṣṇa is the treasure of My life. Indeed, Kṛṣṇa is the very life of My life. I therefore keep Him always in My heart and try to please Him by rendering service. That is My constant meditation.