Article — Gury-Ballerini, Compendium of Moral Theology (8th ed., 1884)

Article III. On the Cessation of a Vow

329.
  1. The obligation of a vow can cease:
329.
  1. Because of intrinsic causes, namely by cessation of the end or motive cause, substantial change of matter, and impossibility, whether physical or moral, as was said above concerning laws, n. 121.
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329.
  1. Because of extrinsic causes, namely by irritation, dispensation, and commutation, concerning which we must speak individually.

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