Śrīmad-Bhāgavatam · Text 11.22.34
Who is speaking and story frame
आत्मा परिज्ञानमयो विवादो
ह्यस्तीति नास्तीति भिदार्थनिष्ठ: ।
व्यर्थोऽपि नैवोपरमेत पुंसां
मत्त: परावृत्तधियां स्वलोकात् ॥ ३४ ॥
ātmāparijñāna-mayo vivādo
hy astīti nāstīti bhidārtha-niṣṭhaḥ
vyartho ’pi naivoparameta puṁsāṁ
mattaḥ parāvṛtta-dhiyāṁ sva-lokāt
The speculative argument of philosophers — “This world is real,” “No, it is not real” — is based upon incomplete knowledge of the Supreme Soul and is simply aimed at understanding material dualities. Although such argument is useless, persons who have turned their attention away from Me, their own true Self, are unable to give it up.
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.