Léon XIV and Jérôme Lejeune: "The value of a person does not depend on what they achieve"

In a letter addressed to the Jérôme Lejeune Foundation, Leo XIV pays tribute to the Catholic geneticist and opponent of abortion. Five days before the French vote on assisted dying, this papal gesture takes on particular significance.

Verified Facts

Gènéthique reports that Leo XIV addressed a letter to the Jérôme Lejeune Foundation in which he pays tribute to the French Catholic geneticist (1926-1994), discoverer of trisomy 21 and tireless defender of the lives of people with disabilities. The Pope's central quote: "The value of a person does not depend on what they achieve or produce."

Jérôme Lejeune, whose beatification cause is underway, had sacrificed his international scientific career by refusing to participate in prenatal screening for eugenic purposes in the 1970s-1980s. He is one of the few Catholic scholars of the 20th century to have personally paid, in terms of academic recognition and a missed Nobel Prize, the price of his ethical consistency.

Analysis of Underlying Issues

Leo XIV's letter comes at a pivotal moment: five days before the French National Assembly's vote on assisted dying, and in direct continuation of the encyclical Magnifica Humanitas, which addressed human dignity in the face of technology. The choice of Lejeune as a reference figure is not coincidental.

Lejeune precisely embodies the thesis that Leo XIV defends in the encyclical: the dignity of the human person is unconditional and is not measured by cognitive, productive, or social capacities. This is an assertion directly opposed to the utilitarian logic that underpins both prenatal eugenics and assisted dying.

The connection is clearly established: between the "right" not to be born disabled and the "right" to die when life becomes a burden, there is a common logic that Lejeune had identified as early as the 1970s.

Doctrinal Insight

Leo XIV's statement echoes the Church's consistent doctrine since Evangelium Vitae (John Paul II, 1995): "Human beings are called to a fullness of life which far exceeds the dimensions of their earthly existence, because it consists in sharing the very life of God" (EV, n. 2). The value of a life is not measured by its performance.

This doctrine has a direct practical implication: it prohibits classifying lives according to their "quality" or "social utility." This is precisely what is structurally done by selective prenatal screening programs and assisted dying laws that condition access to medically assisted death on a state of "unbearable suffering"—that is, a qualitative judgment on the value of continued life.

Food for Thought

Jérôme Lejeune is an exact counter-model for our time: he chose scientific truth and ethical consistency over institutional recognition. His beatification cause, explicitly supported by Leo XIV, is itself a hermeneutical act: the Church states that such a life is a model for 21st-century Catholics, not despite its institutional "failures," but because of its fidelity.