CC Madhya 8.59

prabhu kahe, — “eho bāhya, āge kaha āra”
rāya kahe, “kṛṣṇe karmārpaṇa — sarva-sādhya-sāra”
Word for word: 
prabhu kahe — the Lord said; eho — this; bāhya — external; āge — ahead; kaha — say; āra — more; rāya kahe — Śrī Rāmānanda Rāya said; kṛṣṇe — unto Kṛṣṇa; karma-arpaṇa — offering the results of activities; sarva-sādhya-sāra — the essence of all means of perfection.
Translation: 
The Lord replied, “This is external. You had better tell Me of some other means.”
Purport: 

Rāmānanda replied, “To offer the results of one’s activities to Kṛṣṇa is the essence of all perfection.”