The agencies of national education must therefore concern themselves with the preservation of racial purity. The family must so influence its members that men do not marry women of a foreign racial type, and girls do not marry men of a foreign race. The school must explain the grounds for the harmfulness of mixed marriages. The state, through its laws, must regulate the influx of foreign blood. The state has the right and duty, by means of certain principles, to protect the purity of the blood of its nation when this is threatened with being destroyed by the uncontrolled and excessive influx of foreign blood. Mixed marriages may be tolerated only when the ethnic type of the spouses is not too different (e.g., Lithuanians and Latvians, Germans and Dutch), when such marriages constitute only a small percentage, and when the national culture is strong. The union of closely related ethnic types can sometimes even produce a fortunate combination, because from the other type the body may acquire characteristics that it lacked in its own type.

— Antanas Maceina; National Education (1934)

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