For God so loved the world, that He gave His only begotten Son, that whoever believes in Him shall not perish, but have eternal life. (John 3:16) Read the whole chapter here.
The very nature of our God is generosity. He held nothing back for you. God gave up the very thing that meant the most to him: Jesus. God doesn't give you the leftovers. He doesn't give you the overflow. God gives you and every person on planet Earth the first fruits, the greatest gift of all.
God gave Jesus to people that didn't deserve him. That is generosity. As you become more like Jesus, the evidence should be the generosity you show to your local church, family, and neighbors.
Is there evidence of generosity in your life? Remember, your don't have to be rich to be generous. You just have to be generous to be generous.