In Catholic teaching, a mystic is someone who experiences a deep, transformative union with God. This experience profoundly shapes their life and often manifests in extraordinary spiritual gifts or acts of virtue. While mystical experiences are not a requirement for sainthood, they can be a significant part of the evidence of holiness considered during the canonization process. The Church investigation meticulously examines the candidate's life, writings, and witness accounts. If exceptional mystical experiences are documented and considered authentic, they contribute to the overall assessment of their sanctity. This forms part of a recognized stage in the lengthy process. A declaration by the Pope, following rigorous scrutiny, ultimately determines whether the candidate is declared a saint.