A Comparative Religions 352: History and Development of Modern Christian Thought essay by Brooke Paz.
Case Study: Thomas Aquinas on When Life Begins
In The Summa Theologica, St. Thomas Aquinas provided an explanation for how the soul is produced. He suggested that sperm power generates the human soul[1], but this soul does not enter the fetus until later in development. In this case study I will explain what these ideas mean, why they are problematic, and provide my own case for the existence of the human soul at conception.
To begin, Aquinas was a priest dedicated to academics, service, and defending his faith. In the Middle Ages, mysticism and scholasticism were two important concepts characteristic of the time period. Theologians based their worldview on the reconciliation of Biblical doctrine and Greek philosophy. Aquinas accomplished this through the incorporation of many Aristotelian principles in his theology, including the idea that a human’s soul entered the male embryo 40 days after conception and the female embryo after 90 days[2]. Aristotle also believed the soul was distinct and separate from the body. Aquinas integrated these concepts into his own religious beliefs, claiming that God made intellectual souls at the beginning of the world, but they did not enter the embryo until later in development.
Additionally, this time period is known as the Dark Ages due to the lack of science, art, books, medicine, and literacy. The Catholic Church forbid dissection[3], limiting the understanding of anatomy. However, Aquinas studied under a well-known scientist, theologian, and philosopher named Albertus Magnus[4]. This education likely shaped his views of the body and spirituality. During this time, people also believed in spontaneous generation[5], or the production of living matter through nonliving matter. For example, a woman was thought to possess nonliving fetal matter, while a man produced nonliving seminal fluid. Bringing these two substances together through the process of sexual intercourse created a vegetative being, which later formed into a sensitive being, and then an intellectual being. This, again, incorporated ideas from Aristotle, who believed in a set of mental hierarchies called the chain of being. At the top of this chain was God. Below him were angels and then demons. These higher beings were said to interact with the lower dimension, which included humans, animals, fish, plants, and inanimate matter. The beings ranked lower on the chain indicated reduced mental capacities. Therefore, what made human beings distinct from plants and animals was their intellectual ability.
Moreover, Aquinas further developed this theory in The Summa Theologica. He believed in three types of souls: vegetative, sensitive, and intellectual. The vegetative soul performed basic functions of existence, such as growth, reproduction, and nourishment. The sensitive soul was related to movement, perception, and sensation. Plants only had a vegetative soul, while animals possessed both the vegetative soul and sensitive soul. On the other hand, a human was distinct due to their intellectual soul. This encompassed rationality, reason, and thought. The intellectual soul also carried that person’s knowledge into the afterlife[6]. However, Aquinas did not believe this intellectual soul was present in a human being until weeks after conception. Rather, he concluded that humans underwent a process of development physically and spiritually, leading to delayed ensoulment.
Despite the deficiency of scientific knowledge at the time, I think Aquinas’s understanding of the human body and soul were well-thought-out. However, I do not believe humans gain their personhood or what makes them non-animals through seminal power weeks after conception. Other possible theories of ensoulment include implantation, post-birth, and later in the baby’s development outside of the womb. To begin, a human may gain their soul when the embryo drops and settles in uterine lining one week after fertilization, officially causing pregnancy. On the other hand, the soul may enter the body when a baby takes its first breath out of the womb or when it demonstrates the capacity for rational thought.
However, these theories are problematic because they are just natural stages of physical development. Intellectual processes actually begin at conception when the cells intentionally form the embryo, causing it to develop and grow into a fully functioning fetus over time. The nutritive and sensitive “souls” are present in these physical reactions, but it seems intelligent design is also at play during the processes. Therefore, I believe humanness begins at conception when the semen and egg meet.
To start, Aquinas believed God put the baby in man, which was then transferred to the woman through intercourse. However, neither the semen nor the egg alone can produce an embryo. Because of the advances in science and technology, we now know that our cells contain 23 pairs of chromosomes, whereas an egg and sperm cell each carry only one part of the pairs. So when the sperm cell penetrates the egg, there is an immediate chemical reaction[7] causing the chromosomes to pair up[8]. This is the process of fertilization, which releases the genetic combinations of the parents, creating a new and unique set of DNA in the embryo. Therefore, the embryo needs both the sperm and egg to animate in the first place.
However, Aquinas accurately stated in The Summa Theologica that beings only reproduce after their own kind. Therefore, if humans only breed humans, their humanity must exist from the moment the being is created. Otherwise, without the intellectual soul to differentiate it, that being would be reduced to the status of nonhuman animal or plant.
Additionally, from a Biblical perspective, various verses seem to establish human life at conception. For example, Isaiah 44:24 says, “This is what the Lord says- your Redeemer, who formed you in the womb: ‘I am the Lord, the Maker of all things, who stretches out the heavens, who spreads out the earth by myself.’” In this verse, God established that He makes all things, including the child in the womb. Another passage that supports this idea is Psalm 139: 13-14, which says, “For you created my inmost being; you knit me together in my mother’s womb. I praise you because I am fearfully and wonderfully made; your works are wonderful; I know that full well.” This passage reaffirms the idea that God intentionally creates life through processes that happen within the womb, indicating an intellectual design. God’s design for development is written in human cells, allowing them to naturally form and sustain the fetus.
Therefore, the human soul must enter the embryo when fertilization creates human life. Discussing this concept is particularly important due to the timely and contentious issue of abortion. Many people disagree on whether a fetus has moral value and the right to life. This dissension stems from arguments regarding the beginning of human life and personhood. Although a fetus begins as a clump of cells, there are important and intentional processes going on at the beginning of conception, which lead to rapid fetal growth and development in the womb.
To ensure that this proposed solution is correct, and that both the life and soul of a human begins at fertilization, there must be more scientific research into the forces that happen at conception. Unfortunately, it is difficult to make spiritual observations in physical experiences. However, more examinations of reactions in the womb may prove that, even though the brain isn’t formed yet in the embryo, cells function in an intentional and logical manner indicative of an intellectual soul.
Bibliography
Aquinas, St. Thomas. “The Summa Theologica.” Dhspriory. Trans. Fathers of the English Dominican Province. N.p., 2 Jan. 1998. Web. 13 Feb. 2017.
Brind’Amour, Katherine. “St. Thomas Aquinas (c. 1225-1274).” The Embryo Project Encyclopedia. Arizona Board of Regents, 11 Nov. 2007. Web. 13 Feb. 2017.
Catholic Answers Staff. “Was St. Thomas Aquinas wrong about when human life begins?” Catholic Answers. Catholic Answers, 4 Aug. 2011. Web. 13 Feb. 2017.
“Ensoulment.” Wikipedia. Wikimedia Foundation, 13 Feb. 2017. Web. 13 Feb. 2017.
Harris, Dr. Beth, and Dr. Steven Zucker. “The study of anatomy.” Khan Academy. Khan Academy, 2017. Web. 13 Feb. 2017.
“How Fertilization Happens.” What To Expect. Everyday Health, 2017. Web. 13 Feb. 2017.
McInerny, Ralph. “Saint Thomas Aquinas.” Stanford Encyclopedia of Philosophy. Stanford University, 23 May 2014. Web. 13 Feb. 2017.
Sapolsky, Robert. “Sperm contains dad’s lifestyle information alongside basic genetic material.” Genetic Literacy Project. Disqus, 11 Sept. 2014. Web. 13 Feb. 2017.
The NIV. Grand Rapids, MI: Zondervan Bible Pub., 1983. Print.
[1] Aquinas, St. Thomas. “The Summa Theologica.” Dhspriory. January 2, 1998. Accessed February 13, 2017. http://dhspriory.org/thomas/english/summa/FP/FP118.html#FPQ118OUTP1.
[2] “Ensoulment.” Wikipedia. February 13, 2017. Accessed February 13, 2017. https://en.wikipedia.org/wiki/Ensoulment.
[3] Harris, Dr. Beth, and Dr. Steven Zucker. “The study of anatomy.” Khan Academy. 2017. Accessed February 13, 2017. https://www.khanacademy.org/humanities/renaissance-reformation/early-renaissance1/beginners-renaissance-florence/a/the-study-of-anatomy.
[4] Brind’Amour, Katherine. “St. Thomas Aquinas (c. 1225-1274).” The Embryo Project Encyclopedia. November 11, 2007. Accessed February 13, 2017. https://embryo.asu.edu/pages/st-thomas-aquinas-c-1225-1274.
[5] Catholic Answers Staff. “Was St. Thomas Aquinas wrong about when human life begins?” Catholic Answers. August 4, 2011. Accessed February 13, 2017. https://www.catholic.com/qa/was-st-thomas-aquinas-wrong-about-when-human-life-begins.
[6] McInerny, Ralph. “Saint Thomas Aquinas.” Stanford Encyclopedia of Philosophy. May 23, 2014. Accessed February 13, 2017. https://plato.stanford.edu/entries/aquinas/#ThoAri.
[7] “How Fertilization Happens.” What To Expect. 2017. Accessed February 13, 2017. http://www.whattoexpect.com/preconception/fertility/how-fertilization-happens.aspx.
[8] Sapolsky, Robert. “Sperm contains dad’s lifestyle information alongside basic genetic material.” Genetic Literacy Project. September 11, 2014. Accessed February 13, 2017. https://www.geneticliteracyproject.org/2014/09/11/sperm-contain-dads-lifestyle-information-alongside-basic-genetic-material/.