The word siddha is very significant. Siddha refers to one who has realized the Brahman effulgence and who has complete knowledge that the living entity is not a material atom but a spiritual spark. This understanding is described in the Bhagavad-gita as brahma-bhuta. In the conditioned state, the living entity is known as jiva-bhuta, or "the living force within matter." Brahma-bhuta living entities are allowed to stay in Brahmaloka or Siddhaloka, but unfortunately they sometimes again fall into the material world because they are not engaged in devotional service. This is supported by Srimad-Bhagavatam (10.2.32): ye 'nye 'ravindaksa. These semi-liberated souls falsely claim to be liberated, but unless one engages in devotional service to the Lord, he is still materially contaminated. Therefore these living entities have been described as vimukta-maninah, meaning that they falsely consider themselves liberated although their intelligence is not yet purified. Although these living entities undergo severe austerities to rise to the platform of Siddhaloka, they cannot remain there perpetually, for they are bereft of ananda (bliss). Even though these living entities attain the brahma-bhuta stage and realize the Supreme Personality of Godhead through His bodily effulgence, they nonetheless fall down due to neglecting the Lord's service. They do not properly utilize whatever little knowledge they have of the Supreme Personality of Godhead. Not attaining ananda, or bliss, they come down to the material world to enjoy. This is certainly a falldown for one who is actually liberated. The bhaktas consider such a falldown equal to achieving a place in hell.

The followers of the Patanjali yoga system actually want to merge into the body of the Supreme Personality of Godhead. This indicates that they do not want to engage in His service despite their knowledge of Him, and thus their position is even more abominable than that of those who want to merge into the Lord's effulgence. These yogis meditate on the four-handed Visnu form of the Lord in order to merge into His body. The Patanjali system describes the form of the Lord as klesa-karma-vipakasayair aparamrstah purusa-visesa isvarah: "The Supreme Personality of Godhead is a person who does not partake of a miserable material life." The yogis accept the eternity of the Supreme Person in one of their mantras-sa purvesam api guruh kalanavac-chedat: "Such a person is always supreme and is not influenced by the element of time." The followers of the Patanjali system therefore accept the eternity of the Supreme Personality of Godhead, yet, according to them: purusartha-sunyanam pratiprasavah kaivalyam svarupa-pratistha va citi-saktir iti. They believe that in the perfectional stage, the conception of purusa is vanquished. According to their description: citi-saktir iti. They believe that when one becomes perfect, he cannot remain a person. This yoga system is therefore abominable because its final conception is impersonal. In the beginning, these yogis accept the Supreme Personality of Godhead, but they ultimately give up this idea in order to become impersonal. They are most unfortunate because although they have a personal conception of the Absolute Truth, they neglect to render devotional service to the Lord and thus fall down again into the material world. This is supported by Srimad-Bhagavatam (10.2.32). Aruhya krcchrena param padam tatah patanty adho 'nadrta-yusmad-anghrayah: due to neglecting the lotus feet of the Lord, these yogis again fall down into the material existence (patanty adhah). Consequently this path of yoga is more abominable than the impersonalists' path. This conclusion is also supported by Lord Kapiladeva in the following verse from Srimad-Bhagavatam (3.29.13).