Nārada Muni continued: By devotional service one cannot achieve such intense absorption in thought of the Supreme Personality of Godhead as one can through enmity toward Him. That is my opinion.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
कीटः पेशस्कृता रुद्धः कुड्यायां तमनुस्मरन् । संरम्भभययोगेन विन्दते तत्सरूपताम्
kīṭaḥ peśaskṛtā ruddhaḥ kuḍyāyāṃ tamanusmaran | saṃrambhabhayayogena vindate tatsarūpatām
SB 7.1.27