So who are those sādhus? That is also mentioned in the śāstra, we have already discussed.
- svayambhūr nāradaḥ śambhuḥ
- kumāraḥ kapilo manuḥ
- prahlādo janako bhīṣmo
- balir vaiyāsakir vayam
- (SB 6.3.20)
That two..., twelve personalities are mentioned especially, that they are mahājana, they are authorized, bona fide guru, and you have to follow their path. It is not difficult. So Svayambhū means Lord Brahmā. Svayambhūḥ nāradaḥ śambhuḥ. Śambhu means Lord Śiva. So each of them, out of these twelve mahājana, four are very prominent, that is, Svayambhū means Brahmā, and then śambhuḥ, Lord Śiva, and then kumāraḥ. And there is another sampradāya, Śrī sampradāya, from Lakṣmījī. So we have to accept a spiritual master who are strictly in these four line of disciplic succession. Then we shall be gainer. If we accept a so-called guru, then it will not be possible. We have to accept guru in the disciplic succession. Therefore it is recommended here, tat-puruṣa-niṣevayā: we have to serve him faithfully and always honestly. Then our purpose will be served. And if you take to this line of action, dedicating life to Kṛṣṇa and always engaged in the service of Kṛṣṇa under the direction of tat-puruṣa—means who has no other business than to preach Kṛṣṇa consciousness—then our life is successful. We become free from all sinful reaction, and without being purified... Because Kṛṣṇa, or God, is pure. Arjuna said, paraṁ brahma paraṁ brahma pavitraṁ paramaṁ bhavān: "My Lord Kṛṣṇa, You are the supreme pure." So unless we are pure we cannot approach Kṛṣṇa. That is the statement in the śāstra. Without becoming fire, you cannot enter into fire. Similarly, without becoming completely pure, you cannot enter into the kingdom of God. That is accepted by all religious system. The Christian system is also like that, that without becoming pure you cannot enter into the kingdom of God.