Selfishness in Christians is akin to a kid not sharing a French fry when his dad owns the whole McDonald's.
She opens her hand to the poor and reaches out her hands to the needy. - Proverbs 31:20
"Do not neglect doing good and sharing, for with such sacrifices God is pleased." - Hebrews 13:16
How do you think people can get selfishness out of their hearts?