Miracles in the lives of the saints are accessible through different kinds of testimony: letters and biographies from their circle, statements under oath, medical observations, and surviving objects. A precise presentation begins with this concrete evidence.
For stigmata, the bodily findings are examined; for bilocation, the independent attestation of place and time; for blood liquefaction, the substance and its behavior. The investigative approach explains how examinations supplement testimony and how objections are assessed against the individual event.
The Church's Examination of the Individual Sign
Association with a saint does not replace individual examination. In canonical proceedings, conduct of life and alleged miracles are investigated separately. For miracles, experts are consulted first — physicians for healings — followed by theologians and the competent cardinals and bishops. For presentation, this distinction means that a person's canonization must not be used as a blanket seal of authenticity for every anecdote attributed to that person.[1]
Stigmata: Describe the Bodily Findings First
Here, stigmata means bodily marks or wounds associated with the wounds of Christ's Passion. Medically, their location, extent, depth, bleeding, pain, onset, and healing course must first be recorded. Dated photographs with a scale and medical follow-up help make genuine comparisons of changes. One striking photograph reveals neither the onset nor the cause of a wound.
A sound professional assessment records prior illnesses, treatments, medication, and possible external influences. Depending on the findings, dermatological, infectious-disease, or coagulation investigations may be added. Taking a tissue sample is not automatically mandatory; medical benefit, consent, and the burden on the person must be considered. Suspected self-injury must be investigated through findings and cannot simply be asserted because the case is unusual.
The decisive distinction is this: a real wound may be securely documented while its origin remains unexplained. The medical conclusion must state precisely that scope. Spiritual interpretation of the Passion and the Church's overall judgment are further steps. For historical cases, the editors must not replace missing examinations with present-day speculation; they name the medical reports actually preserved and their limitations. This section explains a possible professional investigative approach, not a special Vatican “stigmata norm.”
Bilocation: Two Places, the Same Time, Independent Witnesses
Bilocation means the reported presence of the same person in two separate places at the same time. Above all, this requires a sound chronology. Both locations must be independently attested; approximate statements such as “on the same afternoon” do not suffice to rule out ordinary travel. Times, distances, and the means of transport then available therefore belong in the investigation.
Identification is equally important: did the witness speak to the person, recognize the person at close range, or merely see a similar figure? Was the name recorded immediately or assigned only after learning of a saint's life? A dream, an interior vision, an account of help, and a claim of bodily presence are different statements. A later tradition may be religiously significant without having the precision of a contemporary record. This application of source criticism explains why every cited witness statement must be presented with its date of origin and its actual scope.
Blood Liquefaction and Other Changes in Objects
Substance and process must first be distinguished: a reddish liquid is not yet proof of human blood; an identified blood component does not yet explain liquefaction. Temperature, movement of the vessel, resting time, lighting, and repeated observations are relevant to the process. If a sample may be taken, its origin, custodians, and the method used must be documented. Examinations of the original, of a removed sample, and of a reconstructed comparison substance must not be conflated.
A laboratory experiment published in 1991 provides a concrete example: Garlaschelli, Ramaccini, and Della Sala produced an iron-containing mixture that became more fluid after movement and solidified again at rest. This behavior is called thixotropy. The experiment demonstrated a natural mechanism for a similar visible sequence. It was not a chemical analysis of the contents of the venerated ampoule in Naples. A successful reproduction therefore establishes neither identity of material nor a complete explanation of the historical case. Conversely, such a mechanism must be considered as a testable alternative.[2][3]
Sources and procedural documents
- [1] Divinus perfectionis Magister
Distinguishes investigation of life and virtues from expert and theological investigation of alleged miracles.
Open source · vatican.va ↗ - [2] Working bloody miracles
Primary scientific report on a thixotropic comparison material; not an analysis of the original Naples ampoule.
Open source · nature.com ↗ - [3] A Thixotropic mixture like the blood of Saint Januarius (San Gennaro)
Freely accessible reproduction of the experimental report on CICAP; the date refers to the original report.
Open source · cicap.org ↗