sarvathaiva durūho 'yam
abhaktair bhagavad-rasaḥ
tat pādāmbuja-sarvasvair
bhaktair evānurasyate
sarvathā - in all respects; eva - certainly; durūhaḥ - difficult to be understood; ayam - this; abhaktaiḥ - by nondevotees; bhagavat-rasaḥ - the exchange of transcendental mellows with the Supreme Personality of Godhead; tat - that; pāda-ambuja-sarva-svaiḥ - whose all in all is the lotus feet; bhaktaiḥ - by devotees; eva - certainly; anurasyate - is relished.
This verse is also found in the Bhakti-rasāmṛta-sindhu (2.5.131).