This is the sign of mahātmā. Bhajanty ananya-manasaḥ: "Without any deviation, without any other occupation, they are always engaged in devotional service." This is mahātmā. Sa mahātmā sudurlabhaḥ. There are many, so many bogus mahātmās—the svāmīs, yogīs and incarnation and so many rascals—all rākṣasas, atheist. Such kind are not mahātmā. Sa mahātmā sudurlabhaḥ (BG 7.19). That mahātmā, who is actually mahātmā, means bhajanty ananya-manasaḥ, engaged fully in Kṛṣṇa consciousness. That is ma . . . sa mahātmā sudurlabhaḥ. Sudurlabhaḥ means very, very rare to find out. The rascals posing themselves as mahātmā, that is another thing. That is not authorized.
You have to accept anything from the authorized source. So according to Vedic civilization, all knowledge is received from the Vedas, perfect authorized source. Śruti-pramāṇa, evidence from the śruti, from the Vedas, that is perfect. Therefore, according to Vedic civilization, if you want to establish something you have to quote the section or the injunction from the Vedas. Then it is perfect. In learned circle you cannot say anything hodgepodge. That will not be accepted. If you support your statement from the evidence of the Vedas, then you are accepted as authority.