athāpi te deva padāmbuja-dvaya-
prasāda-leśānugṛhīta eva hi
jānāti tattvaṁ bhagavan-mahimno
na cānya eko 'pi ciraṁ vicinvan
atha - therefore; api - indeed; te - Your; deva - my Lord; pada-ambuja-dvaya - of the two lotus feet; prasāda - of the mercy; leśa - by only a trace; anugṛhītaḥ - favored; eva - certainly; hi - indeed; jānāti - one knows; tattvam - the truth; bhagavat - of the Supreme Personality of Godhead; mahimnaḥ - of the greatness; na - never; ca - and; anyaḥ - another; ekaḥ - one; api - although; ciram - for a long period; vicinvan - speculating.
This verse is a quotation from Śrīmad-Bhāgavatam (10.14.29). It is explained in the Madhya-līlā, in the sixth chapter, text 84.