I answer that, In the commandments, especially those which in some way are of natural law, a dispensation is like a change in the natural course of things: and this course is subject to a twofold change. First, by some natural cause whereby another natural cause is hindered from following its course: it is thus in all things that happen by chance less frequently in nature. In this way, however, there is no variation in the course of those natural things which happen always, but only in the course of those which happen frequently. Secondly, by a cause altogether supernatural, as in the case of miracles: and in this way there can be a variation in the course of nature, not only in the course which is appointed for the majority of cases, but also in the course which is appointed for all cases, as instanced by the sun standing still at the time of Josue, and by its turning back at the time of Ezechias, and by the miraculous eclipse at the time of Christ's Passion [*Jos. 10:14; 4 Kgs. 20:10; Is. 38:8; Mt. 27:15]. In like manner the reason for a dispensation from a precept of the law of nature is sometimes found in the lower causes, and in this way a dispensation may bear upon the secondary precepts of the natural law, but not on the first precepts because these are always existent as it were, as stated above (Question [65], Article [1]) in reference to the plurality of wives and so forth. But sometimes this reason is found in the higher causes, and then a dispensation may be given by God even from the first precepts of the natural law, for the sake of signifying or showing some Divine mystery, as instanced in the dispensation vouchsafed to Abraham in the slaying of his innocent son. Such dispensations, however, are not granted to all generally, but to certain individual persons, as also happens in regard to miracles. Accordingly, if the indissolubility of marriage is contained among the first precepts of the natural law, it could only be a matter of dispensation in this second way; but, if it be one of the second precepts of the natural law, it could be a matter of dispensation even in the first way. Now it would seem to belong rather to the secondary precepts of the natural law. For the indissolubility of marriage is not directed to the good of the offspring, which is the principal end of marriage, except in so far as parents have to provide for their children for their whole life, by due preparation of those things that are necessary in life. Now this preparation does not pertain to the first intention of nature, in respect of which all things are common. And therefore it would seem that to put away one's wife is not contrary to the first intention of nature, and consequently that it is contrary not to the first but to the second precepts of the natural law. Therefore, seemingly, it can be a matter of dispensation even in the first way.