Because of the service by which you have proved yourselves, others will praise God for the obedience that accompanies your confession of the gospel of Christ, and for your generosity in sharing with them and with everyone else.
(2  Corinthians 9:13)

We are supposed to share with others.  Along with sharing our services and deeds, we are to share the gospel and material goods.  Sometimes it's hard to part with the goods and difficult to bring up the gospel.  I'm blessed to have some wonderful Christian friends who generously give all of these things (and more) and set a wonderful example for me to follow.