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Portrait of Thomas Aquinas Thomas Aquinas Summa Theologiae — Question 96 - OF THE AUREOLES…

I answer that, Just as by virginity and martyrdom a person wins a most perfect victory over the flesh and the world, so is a most perfect victory gained over the devil, when a person not only refuses to yield to the devil's assaults, but also drives him out, not from himself alone, but from others also. Now this is done by preaching and teaching: wherefore an aureole is due to preaching and teaching, even as to virginity and martyrdom. Nor can we admit, as some affirm, that it is due to prelates only, who are competent to preach and teach by virtue of their office.
Source: Wikisource

Portrait of Thomas Aquinas Thomas Aquinas Summa Theologiae — Question 96 - OF THE AUREOLES…

The uncreated good surpasses all created good. Hence any created end, whether it be the common or a private good, cannot confer so great a goodness on an act as can the uncreated end, when, to wit, an act is done for God's sake. Hence when a person dies for the common good without referring it to Christ, he will not merit the aureole; but if he refer it to Christ he will merit the aureole and he will be a martyr
Source: Wikisource

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