Śrīmad-Bhāgavatam · Text 10.80.33
Who is speaking and story frame
नन्वर्थकोविदा ब्रह्मन् वर्णाश्रमवतामिह ।
ये मया गुरुणा वाचा तरन्त्यञ्जो भवार्णवम् ॥ ३३ ॥
nanv artha-kovidā brahman
varṇāśrama-vatām iha
ye mayā guruṇā vācā
taranty añjo bhavārṇavam
Certainly, O brāhmaṇa, of all the followers of the varṇāśrama system, those who take advantage of the words I speak in My form as the spiritual master and thus easily cross over the ocean of material existence best understand their own true welfare.
Read the purport on Vedabase.ioFrom Canto 10, chapter 14 onward, the translation and purports were completed by Śrīla Prabhupāda's disciples after his departure, and published by the Bhaktivedanta Book Trust.