Śrīmad-Bhāgavatam · Text 10.60.15
Who is speaking and story frame
ययोरात्मसमं वित्तं जन्मैश्वर्याकृतिर्भव: ।
तयोर्विवाहो मैत्री च नोत्तमाधमयो: क्वचित् ॥ १५ ॥
yayor ātma-samaṁ vittaṁ
janmaiśvaryākṛtir bhavaḥ
tayor vivāho maitrī ca
nottamādhamayoḥ kvacit
Marriage and friendship are proper between two people who are equal in terms of their wealth, birth, influence, physical appearance and capacity for good progeny, but never between a superior and an inferior.
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.