When a sadhu chastises or punishes someone, he does not do so for revenge. Maharaja Pariksit had inquired why Narada Muni was subject to such a spirit of revenge (tamah). But this was not tamah, for Narada Muni, in full knowledge of what was for the good of the two brothers, wisely thought of how to cure them. Vaisnavas are good physicians. They know how to protect a person from material disease. Thus they are never in tamo-guna. Sa gunan samatityaitan brahma-bhuyaya kalpate (Bg. 14.26). Vaisnavas are always situated on the transcendental platform, the Brahman platform. They cannot be subject to mistakes or the influence of the modes of material nature. Whatever they do, after full consideration, is meant just to lead everyone back home, back to Godhead.