Śrīmad-Bhāgavatam · Text 11.20.19
Who is speaking and story frame
धार्यमाणं मनो यर्हि भ्राम्यदश्वनवस्थितम् ।
अतन्द्रितोऽनुरोधेन मार्गेणात्मवशं नयेत् ॥ १९ ॥
dhāryamāṇaṁ mano yarhi
bhrāmyad āśv anavasthitam
atandrito ’nurodhena
mārgeṇātma-vaśaṁ nayet
Whenever the mind, being concentrated on the spiritual platform, is suddenly deviated from its spiritual position, one should carefully bring it under the control of the self by following the prescribed means.
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.