He who meditates on the Supreme Personality of Godhead, his mind constantly engaged in remembering Me…is sure to reach Me.
…In this verse Lord Kṛṣṇa stresses the importance of remembering Him. One’s memory of Kṛṣṇa is revived by chanting the mahāmantra, Hare Kṛṣṇa. By this practice of chanting and hearing the sound vibration of the Supreme Lord, one’s ear, tongue and mind are engaged. This mystic meditation is very easy to practice, and it helps one attain the Supreme Lord. (from purport to Bhagavad-gita 8.8)