Bhagavad Gita 13.31

यदा भूतपृथग्भावमेकस्थमनुपश्यति |
तत् एव च ​​विस्तारं ब्रह्म संपद्यते तदा

Translation

When they see the diverse variety of living beings situated in the same material nature, and understand all of them to be born from it, they attain the realization of the Brahman.