---
title: "Summa Theologica, First Half"
author: "Thomas Aquinas"
translator: "Fathers of the English Dominican Province"
languages: [en]
shelf: "Medieval"
section: 1079 of 1210
url: https://scriptura.si/works/thomas-aquinas-summa-theologica-first-half/1079/
cite: "Thomas Aquinas, tr. Fathers of the English Dominican Province, Summa Theologica, First Half, section 1079. Scriptura (scriptura.si), https://scriptura.si/works/thomas-aquinas-summa-theologica-first-half/1079/"
---

# Summa Theologica, First Half

*Thomas Aquinas, tr. Fathers of the English Dominican Province*

God and creation, human action, law and grace, then faith, hope, charity and justice.

## 1079. II–II · Question 77: (d) by Sins Committed in Buying and Selling

Source: https://scriptura.si/works/thomas-aquinas-summa-theologica-first-half/1079/ · cite a paragraph as https://scriptura.si/works/thomas-aquinas-summa-theologica-first-half/1079/#p-N

[¶0] (D) BY SINS COMMITTED IN BUYING AND SELLING (Q 77)

[¶1] OF CHEATING, WHICH IS COMMITTED IN BUYING AND SELLING (FOUR ARTICLES)

[¶2] We must now consider those sins which relate to voluntary commutations. First, we shall consider cheating, which is committed in buying and selling: secondly, we shall consider usury, which occurs in loans. In connection with the other voluntary commutations no special kind of sin is to be found distinct from rapine and theft.

[¶3] Under the first head there are four points of inquiry:

[¶4] (1) Of unjust sales as regards the price; namely, whether it is lawful to sell a thing for more than its worth?

[¶5] (2) Of unjust sales on the part of the thing sold;

[¶6] (3) Whether the seller is bound to reveal a fault in the thing sold?

[¶7] (4) Whether it is lawful in trading to sell a thing at a higher price than was paid for it?