Śrīmad-Bhāgavatam · Text 8.16.21
Who is speaking and story frame
स विधास्यति ते कामान्हरिर्दीनानुकम्पन: ।
अमोघा भगवद्भक्तिर्नेतरेति मतिर्मम ॥ २१ ॥
sa vidhāsyati te kāmān
harir dīnānukampanaḥ
amoghā bhagavad-bhaktir
netareti matir mama
The Supreme Personality of Godhead, who is very merciful to the poor, will fulfill all of your desires, for devotional service unto Him is infallible. Any method other than devotional service is useless. That is my opinion.
Read Śrīla Prabhupāda's purport on Vedabase.io