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A LAW may cease to bind in various ways. It may be abrogated or altogether withdrawn by the legislator, or his successor, or his superior. For he who made the law can unmake it. Derogation is the annulling of some portion of the law, while the rest remains intact. The law may fall into desuetude from non-observance, or on account of a contrary custom being introduced. It may also cease to bind because it no longer attains the purpose for which it was made, and has become useless. It may cease to bind in particular cases because a dispensation has been obtained. Something must be said on custom, on a law becoming useless, and on dispensations. This will be done in the three following sections.

1. A custom in the technical sense must be distinguished from a mere use. A use is a constant manner of acting but without binding force. Thus we take holy water on entering the church, and receive blessed ashes on Ash Wednesday, and palms on Palm Sunday, but there is no obligation of doing so, and no sin is committed if we neglect these pious practices; they are only uses. A custom has the force of law from which it only differs in its origin. It arises from the repeated acts of the community which it binds. However, inasmuch as in ecclesiastical matters at least, the community as such has no legislative authority, the binding force of ecclesiastical customs is derived from the express, tacit, or legal consent of the legislative authority. Legal consent to all customs which have the requisite qualities is given in the last chapter of the Title on Custom in the Decretals, and Can. 27.

2. A custom is said to be according to the law if it confirms and interprets the law by long- continued usage.

It is beside the law if it introduces a new law in a matter for which no written law exists.