In the Brahmanda Purana it is said:

"In Siddhaloka [Brahmaloka] there live two kinds of living entities-those who are killed by the Supreme Personality of Godhead due to their having been demons in their previous lives and those who are very fond of enjoying the impersonal effulgence of the Lord." The word tamasah means "the coverings of the universe." Layers of material elements cover the universe, and outside these coverings is the impersonal Brahman effulgence. If one is destined to remain in the Lord's impersonal effulgence, he misses the opportunity to render service to the Personality of Godhead. Therefore devotees consider remaining in the impersonal Brahman effulgence a kind of punishment. Sometimes devotees think of merging into the Brahman effulgence, and consequently they are promoted to Siddhaloka. Because of their impersonal understanding, they are actually punished. Sarvabhauma Bhattacarya continues to explain the distinction between mukti-pada and bhakti-pada in the following verses.