Lacuna Legis and Canonical Equity

A lacuna legis is not simply a rule that a party dislikes or a question on which a canon is brief. Canon 19 applies when a definite case requires a juridical resolution and no express prescript of universal or particular law, and no controlling custom, supplies it. The interpreter first determines that existing law truly does not answer the case before reaching for supplementary criteria.^[1]

The canon excludes penal matters from this gap-filling method. A delict or penalty cannot be created by analogy, equitable intuition, or an admired precedent when the law has not established it. That safeguard reflects the strict interpretation owed to penal laws and other restrictions on free exercise of rights.

Canon 19 names laws issued in similar matters, the general principles of law applied with canonical equity, the jurisprudence and practice of the Roman Curia, and the common and constant opinion of learned persons. These are not four licenses to choose a preferred outcome. Together they discipline reasoning when the legislator has left an actual case uncovered.

Analogy identifies a materially comparable rule rather than borrowing a phrase because it helps one side. Curial jurisprudence means stable legal reasoning, especially of competent tribunals and dicasteries, not an isolated administrative anecdote. Scholarly opinion must be common and constant; a novel article or private commentary cannot acquire legislative force by being cited.

A judgment under canon 19 resolves the case within the decision-maker's competence. It does not ordinarily promulgate a universal rule, amend the Code, or bind unrelated authorities as if the interpreter were the legislator. Recurring gaps may properly prompt authentic interpretation or legislation, but that later act is distinct from the equitable resolution of the immediate controversy.^[2]

The written decision should identify the gap, the analogous norms or principles used, relevant jurisprudence and learned opinion, and why the result respects rights and ecclesial purpose. Transparent reasoning distinguishes canonical equity from discretion without reasons and makes later review through Administrative Recourse or judicial appeal possible where law provides it.