SB 6.16.21
vacasy uparate ’prapya
ya eko manasa saha
anama-rupas cin-matrah
so ’vyan nah sad-asat-parah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
The words and mind of the conditioned soul cannot approach the Supreme Personality of Godhead, for material names and forms are not applicable to the Lord, who is entirely spiritual, beyond the conception of gross and subtle forms. The impersonal Brahman is another of His forms. May He, by His pleasure, protect us.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
The impersonal Brahman, which is the effulgence of the Lord, is described in this verse.