And if any man will sue you at the law, and take away your coat, let him have your cloak also.
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Augustine of Hippo
AD 430
Hence, in this class of injuries which is atoned for by punishment, such a measure will be preserved by Christians, that, on an injury being received, the mind will not mount up into hatred, but will be ready, in compassion for the infirmity, to endure even more; nor will it neglect the correction, which it can employ either by advice, or by authority, or by [the exercise of] power. There is another class of injuries, where complete restitution is possible, of which there are two species: the one referring to money, the other to labour. And therefore examples are subjoined: of the former in the case of the coat and cloak, of the latter in the case of the compulsory service of one and two miles; for a garment may be given back, and he whom you have assisted by labour may also assist you, if it should be necessary. Unless, perhaps, the distinction should rather be drawn in this way: that the first case which is supposed, in reference to the cheek being struck, means all injuries that are...
Hence also what follows, And if any man will sue you at the law, and take away your coat, let him have your cloak also, is rightly understood as a precept having reference to the preparation of heart, not to a vain show of outward deed. But what is said with respect to the coat and cloak is to be carried out not merely in such things, but in the case of everything which on any ground of right we speak of as being ours for time. For if this command is given with respect to what is necessary, how much more does it become us to contemn what is superfluous! But still, those things which I have called ours are to be included in that category under which the Lord Himself gives the precept, when He says, If any man will sue you at the law, and take away your coat. Let all these things therefore be understood for which we may be sued at the law, so that the right to them may pass from us to him who sues, or for whom he sues; such, for instance, as clothing, a house, an estate, a beast of burde...
Beyond the tolerance of physical injury, the Lord wants us also to have contempt for things of this world and to be so far removed from every lawsuit or contest of judgment. If by chance a slanderer or tempter comes forward to initiate a lawsuit for the sake of testing our faith and desires to rob us of the things which are ours, the Lord orders us to offer willingly not only the things that the person goes after unjustly but even those not demanded. .
For not in the matter of blows only, but of our goods also, He would have such forbearance exhibited. Wherefore He again employs the same strong figure. That is, as in the other case He commands to overcome in suffering, so here again, by allowing ourselves to be deprived of more than the wrong doer expected. However, He did not put it so merely, but with something to enhance it: not saying, give your cloak to him that asks, but to him that would sue you at the law, that is, if he drag you into court, and give you trouble.
And just as, after He had bidden not to call another fool, nor to be angry without cause, He went on and required more, in that He commanded to offer the right cheek also; even so here, having said, Agree with your adversary, He again amplifies the precept. For now He orders us not only to give what the other would have, but even to show forth a greater liberality.
What then! one may say, am I to go about naked? We should not be naked, if we obeyed these saying...
If he drags you into court and harasses you, give him your cloak as well, and not only what he asks for. The "tunic" is what we would call the inner garment, and the "cloak" is the outer garment. But the names are sometimes used one for the other.