Śrīmad-Bhāgavatam · Text 11.28.18
Who is speaking and story frame
ज्ञानं विवेको निगमस्तपश्च
प्रत्यक्षमैतिह्यमथानुमानम् ।
आद्यन्तयोरस्य यदेव केवलं
कालश्च हेतुश्च तदेव मध्ये ॥ १८ ॥
jñānaṁ viveko nigamas tapaś ca
pratyakṣam aitihyam athānumānam
ādy-antayor asya yad eva kevalaṁ
kālaś ca hetuś ca tad eva madhye
Real spiritual knowledge is based on the discrimination of spirit from matter, and it is cultivated by scriptural evidence, austerity, direct perception, reception of the Purāṇas’ historical narrations, and logical inference. The Absolute Truth, which alone was present before the creation of the universe and which alone will remain after its destruction, is also the time factor and the ultimate cause. Even in the middle stage of this creation’s existence, the Absolute Truth alone is the actual reality.
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.