 The title "Saint" denotes a person who has been formally canonized, that is, officially and authoritatively declared a saint, by the Church as holder of the Keys of the Kingdom of Heaven, and is therefore believed to be in Heaven by the grace of God.There are many persons that the Church believes to be in Heaven who have not been formally canonized and who are otherwise titled "saints" because of the fame of their holiness.Sometimes the word "saint" also denotes living Christians.