Because we were adopted first...

If you would really like to dive into what this means, and I highly suggest you do, I would recommend visiting www.togetherforadoption.org . Together for Adoption is a wonderful organization promoting a biblical understanding of adoption (God adopting us into His family), which naturally leads us to respond by doing something about the global orphan crisis (147 million children without families). I love how the founder puts it in a blog entry:

When we were on the outside without hope and home, Jesus brought us into his family (Ephesians 2:12-13, 19). What Jesus did for us is the Gospel.

Today there are millions of orphans in the world without hope and home. When we give orphans hope, when we bring orphans into our families, we reenact the Gospel.

When a church provides hope and homes to children lost in the foster care system, it reenacts the Gospel.

When churches create partnerships with other churches around the world in order to care for orphans, the Gospel is reenacted many times over before a watching world.

Orphan care is Gospel reenactment.