In Srimad-Bhagavatam it is said that due to their poor fund of knowledge, the jnanis are not actually liberated. They simply think that they are liberated. The perfection of knowledge culminates when one comes to the platform of knowing the Supreme Personality of Godhead. Brahmeti paramatmeti bhagavan iti sabdyate. The Absolute Truth (satya-vastu) is described as Brahman, Paramatma and Bhagavan. Knowledge of impersonal Brahman and the Supersoul is imperfect until one comes to the platform of knowing the Supreme Personality of Godhead. It is therefore clearly said in this verse: koti-mukta-madhye 'durlabha' eka krsna-bhakta. Those who search after the knowledge of impersonal Brahman or localized Paramatma are certainly accepted as liberated, but due to their imperfect knowledge they are described in Srimad-Bhagavatam as vimukta-maninah. Since their knowledge is imperfect, their conception of liberation is imperfect. Perfect knowledge is possible when one knows the Supreme Personality of Godhead. This is supported in Bhagavad-gita (5.29):

"The sages, knowing Me as the ultimate purpose of all sacrifices and austerities, the Supreme Lord of all planets and demigods and the benefactor and well-wisher of all living entities, attain peace from the pangs of material miseries."