Each January, three observances converge that reinforce each other and summon the Christian world to work together against injustice.

January 15 is the birthday of Rev. Dr. Martin Luther King, Jr., and on or around that day we observe a national holiday in his honor. A week later, on January 22, we recall the tragic decision made that day in 1973 by the Supreme Court in Roe vs. Wade, unleashing a policy of abortion on demand. On or around January 22, large rallies and marches for life are held from coast to coast. And from January 18 to 25 each year, the Week of Prayer for Christian Unity is observed.

These three great movements are deeply intertwined.

Jesus Christ prayed that his followers would be one, as he and the Father are one. Authentic Christian unity does not mean pretending there are no serious doctrinal disagreements among denominations. It does mean working to come to a deeper understanding of what those differences are and are not, as well as recognizing and building on the real unity that does exist in our common affirmation of Christ and his Lordship in our lives and in the world.

That affirmation of Christ requires that we work to fight injustice. In his encyclical letter on Christian Unity, issued in 1995, Pope John Paul II wrote, "Many Christians from all Communities, by reason of their faith, are jointly involved in bold projects aimed at changing the world by inculcating respect for the rights and needs of everyone, especially the poor, the lowly, and the defenseless…Christians who once acted independently are now engaged together in the service of this cause, so that God's mercy may triumph" (n. 43).

Both the civil rights movement and the pro-life movement are evidence of this common engagement. Both movements seek to secure equal rights for marginalized human beings, despite their appearances, and to apply to law and culture the promises of the Gospel. Both movements have found their "meeting place" and their "launching pad" in the Churches, manifesting this declaration of Dr. Martin Luther King, Jr.:

"I'm always happy to see a relevant ministry. It's all right to talk about 'long white robes over yonder,' in all of its symbolism. But ultimately people want some suits and dresses and shoes to wear down here. It's all right to talk about 'streets flowing with milk and honey,' but God has commanded us to be concerned about the slums down here, and his children who can't eat three square meals a day. It's all right to talk about the new Jerusalem, but one day, God's preacher must talk about the new New York, the new Atlanta, the new Philadelphia, the new Los Angeles, the new Memphis, Tennessee. This is what we have to do."

Defending the equal dignity of every human being after birth strengthens our witness to the rights of those in danger before birth, and vice-versa. The witness, in fact, is ultimately one: the witness to the one Christ, who restores dignity to every human life.

Father Frank Pavone is national director of Priests for Life. Web: www.priestsforlife.org.