One verse

Srimad Bhagavatam 3.21.24

3.21.24

न वै जातु मृषैव स्यात्प्रजाध्यक्ष मदर्हणम् । भवद्विधेष्वतितरां मयि संगृभितात्मनाम् ॥ २४ ॥

na vai jatu mrsaiva syat prajadhyaksa mad-arhanam bhavad-vidhesv atitaram mayi sangrbhitatmanam

na
not
vai
indeed
jatu
ever
mrsa
useless
eva
only
syat
it may be
praja
of the living entities
adhyaksa
O leader
mat-arhanam
worship of Me
bhavat-vidhesu
unto persons like you
atitaram
entirely
mayi
on Me
sangrbhita
are fixed
atmanam
of those whose minds.

The Lord continued: My dear rsi, O leader of the living entities, for those who serve Me in devotion by worshiping Me, especially persons like you who have given up everything unto Me, there is never any question of frustration.