Christ commanded with clarity and demonstrated with humility that we should take part in humanitarian duties, such as caring for prisoners, the poor and the sick, and giving to the needy. He was completely adamant about getting involved with society - not just with teaching and preaching on an exegetical or expository level, but on a level of social need. And we need not be distracted by the liberals when studying this topic. Yes, liberals are very much into humanitarian causes. That is the whole of their religion. They do not believe in the conversion of the heart through the Church, and so they strongly embrace humanitarian work as if everyone were already saved but just in need of social redemption.
When we look at the story of the Good Samaritan in Luke 10:33, we can see that Christ commands us to do good deeds for our society. But why? Isn’t preaching and evangelizing on an exegetical level sufficient for converts? No. The Word does not always need to be preached on an exegetical level outside the gathering of the saints. The good news of the gospel begins with the law of God, and what better way is there to show the law of God than through our own actions? When we demonstrate God’s law through biblically ethical behavior towards others, we are actually humbling them for the redeeming power of Christ to take effect in them. Take a good look at the Proverbs Paul uses in Romans 12:20.
If your enemy is hungry, give him bread to eat; and if your enemy is thirsty, give him water to drink; for in doing so you will heap coals of fire on his head. - Proverbs 25:21-22
Romans 2:4 says, “The goodness of God leads you to repentance.”
From these pasages we can conclude that God’s goodness, which is demonstrated through His people, is drawing His people. Good deeds - demonstrated with love, of course - are what bring people to repentance.
We should be presenting the law not only through preaching and teaching but also through our actions in society. This means promoting ethical change wherever we can. This means going to work in business to show the fruits of the gospel in your business deals or going to work in the military or judicial system to show how to govern a society properly. Preaching the gospel through ethics means being an active Christian in society. God does not call us to hide in the wilderness and wait for a rapture. God calls us to engage society, both to show that the gospel and its fruits are profitable for a productive society, and to humble people so that they recognize the fact that they are sinners.