BG Chap 12 - The consolation prize for the impersonalists
Those who worship the unmanifested (akṣaraṁ), which is indescribable (anirdeśyam), which lies beyond the perception of the senses (avyaktam), all pervading (sarvatra gam), inconceivable (acintyam), unchanging in form (kūṭa-stham), fixed (dhruvam) and immovable (acalam) – the impersonal conception of the Absolute Truth – by controlling their senses, looking on all things equally, intent on the welfare of all, attains Kṛṣṇa alone in the form of Brahman. They achieve Kṛṣṇa but only His effulgence, his nirviśeṣa, or formless aspect, devoid of attributes and activities. Such worship is inferior because of the state of suffering the worshipers undergo. If by good fortune, they later meet a pure devotee, they may accept the personal path and eventually attain Kṛṣṇa’s service.
The impersonalists think of the Absolute Personality of Godhead in two different ways. On the one hand they worship the Lord in His viśva-rūpa, or all-pervading universal form, which is the impersonal form within this material world, and on the other they think of the Lord’s unmanifested, indescribable, subtle form, the impersonal Brahman. The theories of pantheism and monism are respectively applicable to these two conceptions of the Supreme as gross and subtle, but both of them are rejected by the learned pure devotees of the Lord.