Summa Theologica by St. Thomas Aquinas
SS: Treatise On The Cardinal Virtues
Q[112] Of Boasting
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Prologue   A[1]   A[2]  

We must now consider boasting and irony, which are parts of lying according to the Philosopher (Ethic. iv, 7). Under the first head, namely, boasting, there are two points of inquiry:

A[1] To which virtue is it opposed?

A[2] Whether it is a mortal sin?