'God's reign is already present on our earth in mystery. When the Lord comes, it will be brought to perfection' (Vatican Council II, The Church in the Modern World)
That is the hope that inspires Christians. We know that every effort to better society, especially when injustice and sin are so ingrained, is an effort that God blesses, that God wants, that God demands.
These were the words spoken by Oscar Romero minutes before his death, as he concluded his homily during mass at Divine Providence Hospital where he lived. He was killed by an assassin who entered the chapel from the back door and shot him, as he stood at the altar.
The picture is from my trip to El Salvador in 2007. The letters engraved on the wall say: "At this altar Monseñor Romero offered his life to God for his people. "