Śrīmad-Bhāgavatam · Text 11.21.15
Who is speaking and story frame
मन्त्रस्य च परिज्ञानं कर्मशुद्धिर्मदर्पणम् ।
धर्म: सम्पद्यते षड्भिरधर्मस्तु विपर्यय: ॥ १५ ॥
mantrasya ca parijñānaṁ
karma-śuddhir mad-arpaṇam
dharmaḥ sampadyate ṣaḍbhir
adharmas tu viparyayaḥ
A mantra is purified when chanted with proper knowledge, and one’s work is purified when offered to Me. Thus by purification of the place, time, substance, doer, mantras and work, one becomes religious, and by negligence of these six items one is considered irreligious.
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.