Catholic devotions are prayer forms which are not part of the official public liturgy of the Church but are part of the popular spiritual practices of Catholics. Many are officially sanctioned by the Church as profitable for spiritual growth but not necessary for salvation. Often devotions in the Church take the form of formalized prayers, sacred objects or sacred images that arise from private revelations, or personal religious experiences of individuals such as apparitions of Mary or of Christ. Catholic devotions also include the veneration of the saints. The Church has a tradition of thorough investigation of such private revelations and the lives of candidates for sainthood to assure that no natural or scientific explanation can, at the time of investigation, account for any miracles i