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CC Antya 6.234

‘sādhya’-‘sādhana’-tattva śikha iṅhāra sthāne
āmi tata nāhi jāni, iṅho yata jāne
Synonyms: 
sādhya — duty; sādhana — how to execute it; tattva — truth; śikha — learn; iṅhāra sthāne — from him; āmi — I; tata — so much; nāhi jāni — do not know; iṅho — he; yata — as much as; jāne — knows.
Translation: 
“You may learn from him what your duty is and how to discharge it. I do not know as much as he.