The so-called yogīs who concentrate their mind or meditate…

““The so-called yogīs who concentrate their mind or meditate upon the impersonal or void are described here. This verse of Śrīmad-Bhāgavatam describes persons who are expected to be very expert yogīs engaged in meditation but who do not find the Supreme Personality of Godhead seated within the heart. These persons are described here as durātmā, which means a person who has a very crooked heart, or a less intelligent person, just opposite to a mahātmā, which means one who has a broad heart. Those so-called yogīs who, although engaged in meditation, are not broad-hearted cannot find the four-handed Nārāyaṇa form, even though He is seated within their heart. Although the first realization of the Supreme Absolute Truth is impersonal Brahman, one should not remain satisfied with experiencing the impersonal effulgence of the Supreme Lord. In the Īśopaniṣad also, the devotee prays that the glaring effulgence of Brahman may be removed from his eyes so that he can see the real, personal feature of the Lord and thus satisfy himself fully. Similarly, although the Lord is not visible in the beginning because of His glaring bodily effulgence, if a devotee sincerely wants to see Him, the Lord is revealed to him. It is said in Bhagavad-gītā that the Lord cannot be seen by our imperfect eyes, He cannot be heard by our imperfect ears, and He cannot be experienced by our imperfect senses, but that if one engages in devotional service with faith and devotion, then God reveals Himself.””

— A.C. Bhaktivedanta Swami Prabhupāda