स होवाच गार्ग्यः य एवायमाकाशे पुरुष एतमेवाहं ब्रह्मोपास इति ।स होवाचाजातशत्रुः मा मैतस्मिन् संवदिष्ठाः ।पूर्णमप्रवर्तीति वा अहमेतमुपास इति ।स य एतमेवमुपास्ते पूर्यते प्रजया पशुभिर्नास्यास्माल्लोकात्प्रजोद्वर्तते ॥बृह. २,१.५ ॥
In plain words
Gārgya said, "The person who is in space — him indeed I worship as Brahman." Ajātaśatru said to him, "Do not draw me into talk about him. I worship him as the full, the unmoving." He who worships him thus is filled with offspring and cattle, and his offspring do not depart from this world.
The commentators
Bṛhadāraṇyakopaniṣadbhāṣyam· bhāṣya
तथा आकाशे हृद्याकाशे हृदये च एका देवता ; पूर्णम् अप्रवर्ति चेति विशेषणद्वयम् ; पूर्णत्वविशेषणफलमिदम्- पूर्यते प्रजया पशुभिः ; अप्रवर्तिविशेषणफलम्- नास्या- स्माल्लोकात्प्रजोद्वर्तत इति, प्रजा संतानाविच्छित्तिः ॥
In plain words
Likewise, in external space, in the space within the heart, and in the heart itself, resides a single divinity, characterized by two attributes: fullness and non-deviation. The fruit of the attribute of fullness is that one is abundantly endowed with descendants and cattle. The fruit of the attribute of non-deviation is that one's lineage is never cut off from this world, progeny signifying the uninterrupted continuity of descendants.
Close to the Sanskrit
Thus in space, in the heart-space, and in the heart, there is one deity; 'full' and 'non-deviating' are the two qualifiers; this is the fruit of the qualifier of fullness: one is filled with progeny and cattle; the fruit of the qualifier of non-deviation: of this person's progeny, from this world does not turn away, progeny being the non-severance of lineage.