We usually think of abortion as a violation of the Fifth Commandment, "Thou shalt not kill," and that is true. But abortion is wrong for many reasons. It breaks all the commandments.
The Eighth Commandment says, "Thou shalt not bear false witness against thy neighbor." This is not only a matter of falsely testifying that somebody did something wrong, as we see, for example, in the Old Testament story of Susanna (Daniel 13). This commandment also forbids false testimony about who our neighbor is, about what value and dignity our neighbor possesses, and about what our obligations to our neighbor are.
The question in abortion is not only, "When does life begin?" but more deeply, "What does life mean?" What are the implications of being human? Is human life disposable when it is unwanted, or inconvenient, or not recognized by a government? Is there anything about human existence that cries out for recognition and protection apart from what a particular society decides to bestow? What is the truth about humanity? What is the human person destined for? Are we made for the grave or for the skies?
Abortion not only takes a life; it makes a statement about life, and not only about the life it takes, but about the lives of all of us. Abortion says we are disposable. Abortion says our value is determined by others. Abortion says there is no intrinsic dignity in human life that requires its absolute protection, and no destiny that reaches beyond this world or even beyond this Supreme Court.
Do not bear false witness against your neighbor! Abortion lies about the human person. Christ, on the other hand, reveals the truth about human life (see Vatican II, Constitution on the Church in the Modern World #22.) Particularly by His Ascension, He shows that we are made for the heights of heaven, not for the medical waste bag.
"Lord, what is man that You care for him?" (Ps.8:5). The psalmist asked the question, and God Himself answered it in Christ. May our treatment of human life faithfully echo that answer!