Bhagavad-gītā As It Is · Text 10.7
Bhakti, loving dialogue and divine understanding
एतां विभूतिं योगं च मम यो वेत्ति तत्त्वत: ।
सोऽविकल्पेन योगेन युज्यते नात्र संशय: ॥ ७ ॥
etāṁ vibhūtiṁ yogaṁ ca
mama yo vetti tattvataḥ
so ’vikalpena yogena
yujyate nātra saṁśayaḥ
One who is factually convinced of this opulence and mystic power of Mine engages in unalloyed devotional service; of this there is no doubt.
Read Śrīla Prabhupāda's purport on Vedabase.io