This prayer is based on the 20th century apparitions of Our Lady of Fatima, and is attributed to an angel who appeared to the visionaries. It is sometimes called the Angel Prayer. The apparitions of Fatima have been approved by the Holy Catholic Church, thus deemed worthy of belief.
Fatima Prayer to the Holy Trinity
O Most Holy Trinity, Father, Son and Holy Spirit, I adore Thee profoundly. I offer Thee the most precious Body, Blood, Soul and Divinity of Jesus Christ present in all the tabernacles of the world, in reparation for the outrages, sacrileges and indifferences by which He is offended. By the infinite merits of the Sacred Heart of Jesus and the Immaculate Heart of Mary I beg the conversion of poor sinners.