nāyam arhaty asad-vṛtto
naradeva-varāsanam
yo 'dhiyajña-patiṁ viṣṇuṁ
vinindaty anapatrapaḥ
na - never; ayam - this man; arhati - deserves; asat-vṛttaḥ - full of impious activities; nara-deva - of the worldly king or worldly god; vara-āsanam - the exalted throne; yaḥ - he who; adhiyajña-patim - the master of all sacrifices; viṣṇum - Lord Viṣṇu; vinindati - insults; anapatrapaḥ - shameless.
One should not at any time tolerate blasphemy and insults against Lord Viṣṇu or His devotees. A devotee is generally very humble and meek, and he is reluctant to pick a quarrel with anyone. Nor does he envy anyone. However, a pure devotee immediately becomes fiery with anger when he sees that Lord Viṣṇu or His devotee is insulted. This is the duty of a devotee. Although a devotee maintains an attitude of meekness and gentleness, it is a great fault on his part if he remains silent when the Lord or His devotee is blasphemed.