Front Page Titles (by Subject) QUESTION XXI.: OF PRESUMPTION. - Aquinas Ethicus: or, the Moral Teaching of St. Thomas, vol. 1 (Summa Theologica - Prima Secundae, Secunda Secundae Pt.1)
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QUESTION XXI.: OF PRESUMPTION. - St. Thomas Aquinas, Aquinas Ethicus: or, the Moral Teaching of St. Thomas, vol. 1 (Summa Theologica - Prima Secundae, Secunda Secundae Pt.1) 
Aquinas Ethicus: or, the Moral Teaching of St. Thomas. A Translation of the Principal Portions of the Second part of the Summa Theologica, with Notes by Joseph Rickaby, S.J. (London: Burns and Oates, 1892).
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Article I.—Does presumption rely on God or on the presumptuous man’s own strength?
R. Presumption seems to imply a certain immoderation in hope. The object of hope is good, difficult, but possible. Now a thing is possible to man in one way by his own strength; in another way, only by the power of God. There may be presumption by immoderation in respect of both these hopes. Regarding the hope whereby a man confides in his own strength, presumption is found in a man striving for a good as possible to him, when it exceeds his ability. Such presumption is opposed to the virtue of magnanimity, which holds the golden mean in this sort of hope. As regards the hope whereby a man clings to the divine power, there may be presumption by immoderation in this, that a man aims at a thing as possible by the power and mercy of God, which is not possible, as when a man hopes to obtain pardon without repentance, or glory without merits.
Article II.—Is presumption a sin?
Every movement of appetite proceeding upon a false understanding is in itself evil and sinful. But presumption is a movement of appetite, involving as it does a certain inordinate hope. Moreover, it proceeds upon a false understanding, as also does despair: for it is false on the one hand that God does not pardon them that repent, or does not turn sinners to repentance; and false on the other that He grants forgiveness to such as persist in sin, or bestows heavenly glory on them that abandon good works; that being the notion upon which the movement of presumption is formed. And therefore presumption is a sin, but a less sin than despair; because it is more proper to God to have mercy and to spare than to punish, on account of His infinite goodness: for the former course, that of mercy, befits God in respect of Himself, but the latter course of punishment befits Him in view of our sins.
§ 3. To sin with a purpose of continuing in the sin under hope of pardon, is the part of presumption; and this does not diminish, but increases the sin. But to sin in hope of pardon to be obtained some time, with a purpose of abstaining from the sin and repenting of it,—that is not the part of presumption: on the contrary, it diminishes the sin, because the man seems thereby to have his will less bent upon sinning.