Only those who possess the qualities of a brāhmaṇa and are situated in the mode of goodness are eligible to chant the Gāyatrī mantra. Gradually, by constant chanting, they come to realize Parabrahman (the Supreme Brahman), or the Absolute Truth. Only then can they perceive the Supreme Personality of Godhead, along with His transcendental name, form, qualities, pastimes, and paraphernalia, as well as the Vaikuṇṭha planets and the Lord of the Vaikuṇṭha planets, Nārāyaṇa. And when one develops a taste for engaging properly in the Lord's transcendental service and realizes the sublime mellows of devotion, one can see Lord Vāsudeva, Kṛṣṇa.
Mundane philosophers who try to attain the Supreme through the ascending process of knowledge can never achieve their goal. The only result of such an attempt, which naturally confuses them, is that they become rooted to the misunderstanding that man is God and vice versa, thus clearing their way to hell. A few among them may have a moment's glimpse of transcendence, but end up concluding everything backwards. They fall prey to the erroneous impersonal principle.