Evangelism is the most basic and radical ministry possible to a human being. This is not true because the spiritual is more important than the physical, but because the eternal is more important than the temporal… If there is a God, and if life with him for eternity is based on having a saving relationship with him, then the most loving thing anyone can do for one’s neighbor is help him or her to a saving faith in that God.
But, as we have seen, doing justice is inseparably connected to preaching grace. This is true in two ways. One way is that the gospel produces a concern for the poor. The other is that deeds of justice gain credibility for the preaching of the gospel. In other words, justification by faith leads to doing justice, and doing justice can make many seek to be justified by faith…
If we confuse evangelism and social justice we lose what is the single most unique service that Christians can offer the world. Others, alongside believers, can feed the hungry. But Christians have the gospel of Jesus by which men and women can be born again into the certain hope of eternal life. No one else can make such an invitation. However, many Christians who care intensely about evangelism see the work of doing justice as a distraction for Christians that detracts from the mission of evangelism. That is also a grave error."
— Dr. Timothy Keller, “Generous Justice”