Lord Krishna, the Supersoul, Knows everything in everyone’s heart. He Knows everyone’s determination and everyone’s want.
Krishna, The Supreme Personality of Godhead, Chapter 81,
Materialistic sense gratification is simply filling of the holes (Knowledge acquiring senses). The more we fill the more they become empty & hungrier. The only way these holes can be filled is when we fill them with the Complete Whole.
For anything offered to Krishna with love and affection, Krishna can reciprocate many millions of times over, both materially and spiritually.
Srimad Bhagavatam 10.11.11
The Hare Krishna mahamantra is also a prayer, for a prayer addresses the Supreme Personality of Godhead by His name and invokes good fortune by petitioning the Lord to allow one to engage in His devotional service.
Srimad Bhagavatam 4.24.69,