In 1963 Pope Blessed Paul VI declared Good Shepherd Sunday (Fourth Sunday of Easter) to be World Day of Prayer for Vocations.
Prayer For Vocations to the Priestly and Religious Life
“Lord, Jesus Christ, Savior of the world, show forth, we beseech Thee, in Thy Church the Holy Spirit with whose power the apostles were so abundantly filled. We thank Thee for the blessings bestowed upon the work of priests and religious; and we pray that Thou wilt add to the number of those who now pray, labor, and sacrifice themselves for Thy glory. O good Jesus, give us more priests and religious after Thine own Heart! Amen.”
(The Prayer Book: Imprimatur-Samuel Cardinal Stritch Archbishop of Chicago May10, 1954)
Amo Iesu by Grace Pax 