Constant remembrance is possible for one who always chants and hears the glories of Lord Krishna.

One should not think that one can attain complete transcendental knowledge of Kṛṣṇa by mechanically engaging in worship of the Lord. Lord Kṛṣṇa states here that one must endeavor constantly to keep the Lord within one’s mind. Anusmarataḥ, or constant remembrance, is possible for one who always chants and hears the glories of Lord Kṛṣṇa. It is therefore stated, śravaṇam, kīrtanam, smaraṇam: the process of devotional service begins with hearing (śravaṇam) and chanting (kīrtanam), from which remembrance (smaraṇam) develops. One who constantly thinks of the objects of material gratification becomes attached to them; similarly, one who constantly keeps Lord Kṛṣṇa within his mind becomes absorbed in the Lord’s transcendental nature and thus becomes qualified to render personal service to the Lord in His own abode.

Source: A.C. Bhaktivedanta Swami Prabhupada (2014 edition), “Srimad Bhagavatam”, Eleventh Canto, Chapter 14 – Text 27.