All Devotees in Kṛṣṇa consciousness practice chanting some mantra. Certainly one should chant the Hare Kṛṣṇa mantra, which is the mahā-mantra, or great mantra, and also one should practice chanting cintāmaṇi-prakara-sadmasu or the Nṛsiṁha strotra ( ito nṛsiṁhaḥ parato nṛsiṁho yato yato yāmi tato nṛsiṁhaḥ ). Every devotee should practice in order to chant some mantra perfectly so that even though he may be imperfect in spiritual consciousness in this life, in his next life he will not forget Kṛṣṇa consciousness, even if he becomes an animal. Of course, a devotee should try to perfect his Kṛṣṇa consciousness in this life, for simply by understanding Kṛṣṇa and His instructions, after giving up this body one can return home, back to Godhead. Even if there is some falldown, practice of Kṛṣṇa consciousness never goes in vain. For example, Ajāmila, in his boyhood, practiced chanting the name of Nārāyaṇa under t...