"Let giving flow from your heart, not from a sense of religious duty. Let it spring up freely from the JOY of giving—all because God loves hilarious generosity!"
2 Corinthians 9:7-8
It doesn't feel good when someone does something for you because they feel obligated to, rather than doing it because they want to. It's the same with God. He'd rather we didn't give until it comes from a place of deep Joy from the intimacy of knowing Him. We feel the same way too.
We rejoice in generous givers who give this way because we know that they have come to know the Lord intimately. It is a response to His goodness and love, not a duty.