Pius XII says in his allocution to Fiat workers on October 31, 1948:
“Human society always produces, of necessity, a whole scale of degrees and differences in physical and intellectual qualities…”
“The Church does not promise the absolute equality that others claim, for she knows that human society always produces, of necessity, a whole scale of degrees and differences in physical and intellectual qualities, in inner dispositions and tendencies, in occupations and responsibilities.
“Yet, at the same time she ensures complete equality in human dignity, as in the heart of Him who calls unto Himself all those who are weary and burdened.”
“…in inner dispositions and tendencies, in occupations and responsibilities.”
Plinio Corrêa de Oliveira, Nobility and Analogous Traditional Elites in the Allocutions of Pius XII: A Theme Illuminating American Social History (York, Penn.: The American Society for the Defense of Tradition, Family, and Property, 1993), Documents V, p. 485.