Once Yājñavalkya, one of the disciples of Vaiśampāyana, said: O master, how much benefit will be derived from the feeble endeavors of these weak disciples of yours? I will personally perform some outstanding penance.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
याज्ञवल्क्यश्च तच्छिष्य आहाहो भगवन् कियत् । चरितेनाल्पसाराणां चरिष्येऽहं सुदुश्चरम्
yājñavalkyaśca tacchiṣya āhāho bhagavan kiyat | caritenālpasārāṇāṃ cariṣye'haṃ suduścaram
SB 12.6.62