I love Tim Keller's work. It's this month's free download at ChristianAudio.com. Here's a description
Why would someone risk his safety, destroy his schedule, and become dirty and bloody to help a needy person of another race and social class? And why would Jesus tell us “Go and do likewise”? Like the wounded man on the Jericho road, there are needy people in our path—the widow next door, the family strapped with medical bills, the homeless man outside our place of worship. God calls us to be ministers of mercy to people in need of shelter, assistance, medical care, or just friendship.