Shankaracharya's commentary, trans. Alladi Mahadeva Sastry (1897)
[1]When a man realises the whole variety of beings as resting in the One, and is an evolution from that One alone, then he becomes Brahman.
BG 13.31
यदा भूतपृथग्भावम् एकस्थम् अनुपश्यति । तत एव च विस्तारं ब्रह्म सम्पद्यते तदा ॥
yadā bhūta-pṛthag-bhāvam eka-stham anupaśyati | tata eva ca vistāraṃ brahma sampadyate tadā ||
"When the yogi sees all diversity resting in the One and spreading from that One alone — he becomes Brahman."
4 translations · all pre-1928 or released to public domain · sources
When a man realises the whole variety of beings as resting in the One, and is an evolution from that One alone, then he becomes Brahman.
When he sees the separate existence of all beings inherent in the One, and their expansion from That One alone, he then becomes Brahman.
When he perceives the various natures of beings as centred in one place, and their expansion from that place alone, he then obtains Brahman.
When one perceives the various bodies of all beings as resting in the One, and their expansion from that One alone, one then attains Brahman.