My dear Dhruva, besides worshiping the Deity and chanting the mantra three times a day, you should meditate upon the transcendental activities of the Supreme Personality of Godhead in His different incarnations, as exhibited by His supreme will and personal potencies.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
स्वेच्छावतारचरितैरचिन्त्यनिजमायया । करिष्यत्युत्तमश्लोकस्तद्ध्यायेद्धृदयङ्गमम्
svecchāvatāracaritairacintyanijamāyayā | kariṣyatyuttamaślokastaddhyāyeddhṛdayaṅgamam
SB 4.8.57