evaṁ vyavasito buddhyā
samādhāya mano hṛdi
jajāpa paramaṁ jāpyaṁ
prāg-janmany anuśikṣitam
śrī-bādarāyaṇiḥ uvāca-Śrī Śukadeva Gosvāmī said; evam-thus; vyavasitaḥ-fixed; buddhyā-by intelligence; samādhāya-for concentration; manaḥ-the mind; hṛdi-in consciousness or in the heart; jajāpa-he chanted; paramam-a supreme; jāpyam-mantra he had learned from great devotees; prāk-janmani-in his previous birth; anuśikṣitam-practiced.
Śrī Śukadeva Gosvāmī continued: Thereafter, the King of the elephants, Gajendra, fixed his mind in his heart with perfect intelligence and chanted a mantra which he had learned in his previous birth as Indradyumna and which he remembered by the grace of Kṛṣṇa.
Such remembrance is described in Bhagavad-gītā (6.43-44): tatra taṁ buddhi-saṁyogaṁ labhate paurva-dehikam yatate ca tato bhūyaḥ saṁsiddhau kuru-nandana pūrvābhyāsena tenaiva hriyate hy avaśo 'pi saḥ In these verses it is assured that even if a person engaged in devotional service falls down, he is not degraded, but is placed in a position in which he will in due course of time remember the Supreme Personality of Godhead. As explained later, Gajendra was formerly King Indradyumna, and somehow or other in his next life he became King of the elephants. Now Gajendra was in danger, and although he was in a body other than that of a human being, he remembered the stotra he had chanted in his previous life. Yatate ca tato bhūyaḥ saṁsiddhau kuru-nandana. To enable one to achieve perfection, Kṛṣṇa gives one the chance to remember Him again. This is proved here, for although the King of the elephants, Gajendra, was put in danger, this was a chance for him to remember his previous devotional activities so that he could immediately be rescued by the Supreme Personality of Godhead. It is imperative, therefore, that 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