So it does not mean only the sannyāsī and brahmacārī can become mahājana. There are gṛhasthas also. Just like Prahlāda Mahārāja is gṛhastha. Brahmā is gṛhastha. Svayambhū. Svayambhū. Nārada is brahmacārī. Svayambhūr nāradaḥ śambhuḥ (SB 6.3.20). Śambhu, Lord Śiva, is also gṛhastha. Svayambhūr nāradaḥ kumāraḥ, brahmacārī, four Kumāras, from the birth, naiṣṭhika-brahmacārī. Kapila, Kapila is also brahmacārī. Svayambhūr nāradaḥ śambhuḥ kumāraḥ kapilo manuḥ (SB 6.3.20). Manu is gṛhastha. Similarly, Prahlāda Mahārāja is also gṛhastha. Prahlādo janakaḥ. Janaka Mahārāja is also gṛhastha. Bhīṣma, brahmacārī. Bhīṣma, Bali, Bali Mahārāja, gṛhastha. Vaiyāsaki, a brahmacārī. So it doesn't matter whether one is brahmacārī, sannyāsī or gṛhastha, he must know the science.
Just like if you go to a scientist man, you don't inquire whether he is a brahmacārī or sannyāsī or gṛhastha. You require the knowledge. That is also confirmed by Śrī Caitanya Mahāprabhu.