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Immigration is one of the most debated issues of our time. Governments, international organizations, media outlets, and religious leaders constantly discuss borders, integration, human rights, cultural identity, and national sovereignty. Amid this landscape, many Catholics ask: What did the Catholic tradition really teach about immigration? What did Saint Thomas Aquinas think? Is there a Catholic doctrine on borders?
The answer requires depth and rigor, because all too often isolated Gospel passages or selective statements are used to justify opposing ideological positions.
The Summa Theologica of Saint Thomas Aquinas offers extraordinarily relevant principles for addressing this issue from an authentically Catholic perspective. And what is surprising is that his thought does not fit entirely with either the position of completely open borders or that of an exclusionary nationalism.
As is often the case with Saint Thomas, the truth is found in a higher balance where charity, justice, prudence, and the common good converge.
Immigration Is Not a Modern Phenomenon
Before entering into Thomistic theology, it is worth remembering that immigration has accompanied humanity since its origins.
The very history of salvation is marked by migrations:
- Abraham leaves his homeland.
- Joseph is sold and taken to Egypt.
- Israel lives for centuries as a foreign people.
- The Holy Family flees to Egypt to escape Herod.
- The Apostles travel throughout the known world.
The Bible is filled with references to foreigners.
God commands Israel:
“You shall not oppress a foreigner; you know the life of a foreigner, for you were foreigners in the land of Egypt” (Exodus 23:9).
And also:
“You shall love the foreigner, for you were foreigners in the land of Egypt” (Deuteronomy 10:19).
However, Scripture never presents the complete elimination of borders, nor the disappearance of national identities.
Peoples continue to exist.
Nations continue to exist.
Authorities continue to exist.
The question is not whether borders should exist, but how justice and charity should be exercised toward the foreigner.
Saint Thomas and the Foreigner: A Question of Justice
Saint Thomas’s most important reflection on this issue appears in the Summa Theologica (I-II, Question 105, Article 3), where he analyzes the laws of the Old Testament concerning foreigners.
There he carefully distinguishes several types of relationships with those who arrive from outside.
Saint Thomas observes that the Mosaic Law did not treat all foreigners in the same way.
There were degrees of integration.
Some merely passed through.
Others resided temporarily.
Others sought full incorporation into the people.
This observation is fundamental because it shows something that is often forgotten today:
the Catholic tradition has never taught that every person who enters a country automatically acquires all the political and social rights of those who belong to the national community.
Integration is a process.
Not an instantaneous act.
The Thomistic Principle of the Common Good
To understand Saint Thomas’s position correctly, we must recall one of the pillars of his entire political philosophy:
the common good.
Political authority exists to promote the common good of the community it governs.
It does not govern for private interests.
It does not govern for pressure groups.
It does not govern for ideologies.
It governs for the integral good of society.
Therefore, any immigration policy must be evaluated according to one essential question:
Does it contribute to the common good or harm it?
The answer cannot be automatic.
It will depend on concrete circumstances:
- capacity for reception;
- economic situation;
- cultural cohesion;
- security;
- employment;
- housing;
- social stability.
Political prudence requires analyzing each case.
Saint Thomas’s Famous Teaching on Citizenship
One of the most cited passages of the Summa Theologica states that foreigners should not be immediately incorporated into the political body of Israel.
Why?
Because Saint Thomas considers civic friendship to require time.
Belonging to a political community implies sharing:
- history;
- customs;
- traditions;
- responsibilities;
- loyalties.
According to Saint Thomas, a hasty incorporation could damage social unity.
This teaching often surprises modern readers.
However, it does not arise from hostility toward the foreigner.
It arises from concern for the common good.
For the Angelic Doctor, a political society is not a mere aggregation of individuals.
It is a moral community.
And every community needs cohesion in order to survive.
The Virtue of Hospitality
It would be a grave mistake to think that Saint Thomas advocated a closed attitude toward immigrants.
Nothing could be further from the truth.
Hospitality occupies an important place in his moral thought.
The Christian tradition has always considered it a work of mercy to:
“Shelter the pilgrim.”
Christ Himself identifies with the stranger:
“I was a stranger and you welcomed me” (Matthew 25:35).
Welcoming the needy is not a sentimental option.
It is a demand of the Gospel.
Therefore, any Catholic approach that promotes contempt, hatred, or the dehumanization of immigrants directly contradicts the Christian faith.
The Balance Between Charity and Prudence
Here we encounter one of the most brilliant aspects of Thomistic thought.
Charity does not eliminate prudence.
And prudence does not eliminate charity.
Authentic Christian charity does not simply consist in opening the doors without considering the consequences.
But neither does it consist in closing one’s heart to those who suffer.
Saint Thomas teaches that the virtues must work together.
Charity without prudence can become recklessness.
Prudence without charity can degenerate into hardness of heart.
Immigration policy must integrate both dimensions.
Is There an Absolute Right to Immigrate?
From a Thomistic perspective, no.
The Catholic tradition recognizes the natural right of every person to seek worthy conditions for his life and that of his family.
However, that right does not automatically imply that every State is obliged to accept an unlimited number of immigrants under all circumstances.
States have duties.
But they also have rights.
Among them is the protection of the common good of their citizens.
Classical Catholic doctrine has always recognized the legitimacy of borders and political authorities.
The Catechism and Contemporary Doctrine
The Catechism of the Catholic Church maintains a remarkable balance.
On the one hand, it states:
“The more prosperous nations are obliged, to the extent they are able, to welcome the foreigner.”
But it immediately adds:
“Political authorities may make the exercise of the right to immigrate subject to various juridical conditions.”
This second part is often forgotten.
Yet it is essential.
The Church does not teach unlimited and open borders.
Nor does it teach an absolute refusal of hospitality.
It teaches prudent discernment.
Recent Developments in the Church
During recent pontificates, especially since the end of the twentieth century, a strong pastoral emphasis has been placed on welcoming migrants and refugees.
Wars, persecutions, and humanitarian crises have led numerous popes to insist on the moral obligation to help those who suffer.
This emphasis responds to an evident reality:
millions of people live displaced, persecuted, or in extreme poverty.
The Church constantly reminds the world of the inviolable dignity of every human being.
And rightly so.
However, some Catholics have pointed out a tension between certain contemporary pastoral discourses and some classical principles of Thomistic political philosophy.
The Contrast Between Saint Thomas and Certain Modern Interpretations
It is important to distinguish between Catholic doctrine and particular political interpretations of that doctrine.
Saint Thomas places a very strong emphasis on:
- the common good;
- social cohesion;
- cultural identity;
- political prudence;
- gradual integration.
Some contemporary currents tend to emphasize primarily:
- immediate reception;
- human mobility;
- the rights of migrants.
When the balance between these aspects is lost, problems arise.
If one thinks only of welcoming, one may ignore the real capacity for integration.
If one thinks only of security, one may forget the human dignity of the immigrant.
The traditional Catholic vision requires holding both dimensions together.
The Question of Cultural Identity
A particularly relevant issue in Europe is the preservation of cultural identity.
Saint Thomas would never have considered the culture of a people irrelevant.
Culture forms part of the common good.
Nations possess a historical, religious, and moral heritage that deserves protection.
However, protecting cultural identity does not mean hating foreigners.
It means preserving that which allows the continuity of the community.
The Church has always recognized the value of peoples, homelands, and traditions.
Love for one’s nation can be a virtue when properly ordered.
What Would Saint Thomas Do Today?
Naturally, we cannot know.
But we can apply his principles.
He would probably insist on several ideas:
- Every immigrant possesses an inviolable dignity because he is created in the image of God.
- Genuine refugees deserve special protection.
- Nations have the right to protect their borders.
- Immigration policies must be oriented toward the common good.
- Integration requires time.
- Christian charity should inspire all political action.
- Concrete decisions belong to the realm of prudential judgment and do not always admit a single legitimate solution.
A Pastoral Perspective for Catholics Today
Catholics must avoid two temptations.
The first is the ideologization of charity.
The second is the ideologization of security.
Not every immigrant is a threat.
But neither is every immigration policy automatically good simply because it appears compassionate.
The Christian is called to look more deeply.
He must see in the immigrant a person loved by God.
But he must also understand that political authority has real responsibilities regarding the common good.
True Catholic wisdom consists in keeping these principles united.
Conclusion: The Forgotten Wisdom of Saint Thomas
In an age dominated by simplistic slogans, Saint Thomas Aquinas offers a lesson of extraordinary relevance.
Neither xenophobia.
Nor utopianism.
Neither indifference.
Nor sentimentalism.
The Thomistic vision is built upon four inseparable pillars:
- human dignity;
- Christian charity;
- political prudence;
- the common good.
Immigration cannot be approached solely through economics, ideology, or emotion.
It must be approached through a Christian anthropology that simultaneously recognizes the value of every person and the legitimacy of political communities.
The Church has always taught that the foreigner deserves respect, protection, and assistance when necessary. But it has also taught that nations possess rights and duties of their own.
Saint Thomas reminds us that authentic charity does not destroy order but perfects it. And that authentic justice does not oppose mercy but finds its fulfillment within it.
In an increasingly polarized world, this synthesis of truth and charity remains one of the most valuable contributions that the Catholic tradition can offer to the contemporary debate on immigration.
