SB 3.32.31

ity etat kathitaṁ gurvi
 jñānaṁ tad brahma-darśanam
yenānubuddhyate tattvaṁ
 prakṛteḥ puruṣasya ca
Synonyms: 
iti — thus; etat — this; kathitam — described; gurvi — O respectful mother; jñānam — knowledge; tat — that; brahma — the Absolute Truth; darśanam — revealing; yena — by which; anubuddhyate — is understood; tattvam — the truth; prakṛteḥ — of matter; puruṣasya — of spirit; ca — and.
Translation: 
My dear respectful mother, I have already described the path of understanding the Absolute Truth, by which one can come to understand the real truth of matter and spirit and their relationship.