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OF THE VICES OPPOSED TO TRUTH, AND FIRST OF LYING (FOUR ARTICLES)

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We must now consider the vices opposed to truth, and (1) lying: (2) dissimulation or hypocrisy: (3) boasting and the opposite vice. Concerning lying there are four points of inquiry:

(1) Whether lying, as containing falsehood, is always opposed to truth?

(2) Of the species of lying;

(3) Whether lying is always a sin?

(4) Whether it is always a mortal sin?

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Summa Theologica

Aquinas's monumental systematic theology examining whether sacred doctrine is a science, God's existence and nature, divine attributes, moral philosophy, and the full range of Christian doctrine through rigorous philosophical and theological reasoning.

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