So anyone who is declaring himself God, immediately you should know he is the greatest sinful man. And if you study his private life, you will see that he is number one sinful man. This is the test. Otherwise nobody will say that I am God, this false representation. Nobody. Any pious man will not do it. He knows, "What I am? I am ordinary human being. How can I claim to take the position of God?" And they become famous among rascals.
As it is stated in the Śrīmad-Bhāgavatam, śva-viḍ-varāhoṣṭra kharaiḥ (SB 2.3.19). What is that verse? Uṣṭra-kharaiḥ, saṁstutaḥ puruṣaḥ paśuḥ. They.... in this world we see there are many great men, so-called great men, and they are very much praised by the general people. So Bhāgavata says, that anyone who is not a devotee, who never chants the Hare Kṛṣṇa mantra, he may be very great man in the estimation of rascals, but he is nothing but an animal.