This prayer is from , Pope Pius XII July 17, 1956
PRAYER TO BE SAID BY THE LAITY:
O Jesus, eternal High Priest, Good Shepherd, Font of Life, Who by a special favor of Thy most tender Heart hast given to us our priests in order to accomplish in us those holy ideals with which Thy grace inspires our hearts, let Thy mercy, we beseech Thee, come to the aid of our priests.
Grant them, O Jesus, lively faith in their works, unshakable hope in their trials and fervent charity in their intentions. May Thy word, radiant with eternal Wisdom, become through continual meditation, the never failing nourishment of their interior life; may the examples of Thy Life and Passion be renewed in their conduct and sufferings for our instruction and as a light and consolation in our sorrows.
Grant, O Lord, that our priests, free from all earthly attachments and solicitous for Thy glory alone, may persevere to their last breath in the fulfillment of duty and in purity of conscience. And when in death they deliver into Thy hands a task well done may they have in Thee, Lord Jesus, their Master on earth, the eternal reward of the crown of justice in the glory of the Saints. Amen.