The longstanding argument rationalizing the killing of the unborn is the presumption that it solely involves the woman’s body and she can do with it whatever she wants.
Two errors here. First of all, the chromosomes of the baby prove that a second, unique individual is also present. Therefore, it’s not just about the woman’s body.
Secondly, we are only stewards of our bodies, not the ultimate masters of them.
“Everyone is responsible for his life before God who has given it to him. It is God who remains the sovereign Master of life. We are obliged to accept life gratefully and preserve it for his honor and the salvation of our souls. We are stewards, not owners, of the life God has entrusted to us. It is not ours to dispose of.”1
“The Torah states that the human body was created Bi’tzelem Elokim, in the image of God, and is the property of the Creator. Man is given custodial rights to his body, and has no more right to harm or destroy his body than the superintendent has to ransack the building he is hired to maintain…”
“By extension a physician may not hasten the death of a patient, not only because of his duty to preserve life, but because he has no right to destroy the property of another, in this case God… Because one’s body is not his property…”2
Consequently, suggesting that we own ourselves is a position which cannot be held by those who hold to Judeo-Christian traditions.
1 – Paragraph 2280 of the Catechism of the Catholic Church, second edition, Libreria Editrice Vaticana, 25th printing; November, 2013.
2 – “Sanctity of the Human Body,” by Daniel Eisenberg, MD. http://www.aish.com/ci/sam/48960576.html