1 Peter 4:10 says "Each of you should use whatever gift you have received to serve others, as faithful stewards of God's grace in its various forms."
All that we have, or hope to have, comes from God. Your gift is an offering to the Lord, motivated by Christian love, and given from a heart that is thankful for God's blessing of grace, forgiveness, care and protection. Christian giving is an act of worship, praise and thanks. It is a sacrifice of gratitude to God.