Kaṭha Upaniṣad 107

107

yata evam ata eva etad ālambanaṃ brahmaprāptyālambanānāṃ śreṣṭhaṃ praśasyatamam / etad ālambanaṃ paramaparaṃ ca parāparabrahmaviṣayatvāt / etad ālambanaṃ jñātvā brahmaloke mahīyate / parasmin brahmaṇy aparasmiṃś ca brahmabhūto brahmavad upāsyo bhavatīty arthaḥ ///1,2.17 //

Shankara’s Commentary:
Com.—This being so, this prop is the best, i.e., the most praiseworthy of all props, to attain the Brahman. This prop is both the higher and lower; for, it leads to both the highest and the manifested Brahman i.e., of the highest Brahman and the manifested Brahman. The meaning is: he becomes one with the Brahman and he becomes fit to be worshipped like Brahman.