4.

I by no means dispute the perfect correctness of the maxim, that good faith requires an oath to be kept, not according to the mere words of him who gives it, but according to that which the person giving the oath knows to be the expectation of the person to whom he swears. For it is very difficult to define in words, especially in few words, the promise in regard to which security is exacted from him who gives his oath. They, therefore, are guilty of perjury, who, while adhering to the letter of their promise, disappoint the known expectation of those to whom their oath was given; and they are not guilty of perjury, who, even though departing from the letter of the promise, fulfil that which was expected of them when they gave their oath. Wherefore, seeing that the people of Hippo desired to have the holy Pinianus, not as a prisoner who had forfeited liberty, but as a much-loved resident in their town, the limits of that which they expected from him, though it could not be adequately embraced in the words of his promise, are nevertheless so obvious that the fact of his being at this moment absent, after giving his oath to remain among them, does not disturb any one who may have heard that he was to leave this place for a definite purpose, and with the intention of returning. Accordingly, he will not be guilty of perjury, nor will he be regarded by them as violating his oath, unless he disappoint their expectation; and he will not disappoint their expectation, unless he either abandon his purpose of residing among them, or at some future time depart from them without intending to return. May God forbid that he should so depart from the holiness and fidelity which he owes to Christ and to the Church! For, not to speak of the dread judgment of God upon perjurers, which you know as well as myself, I am perfectly certain that henceforth we shall have no right to be displeased with any one who may refuse to believe what we attest by an oath, if we are found to think that perjury in such a man as Pinianus is to be not only tolerated without indignation, but actually defended. From this may we be saved by the mercy of Him who delivers from temptation those who put their trust in Him! Let Pinianus, therefore, as you have written in your communication, fulfil the promise by which he bound himself not to depart from Hippo, just as I myself and the other inhabitants of the town do not depart from it, having, of course, full freedom in going and returning at any time; the only difference being, that those who are not bound by any oath to reside here have it also in their power at any time, without being chargeable with perjury, to depart with no purpose of coming back again.