' Main article: Theology of Pope Pius XII Haurietis aquas (Latin: "You will draw waters") is a landmark encyclical of Pope Pius XII. Written on May 15, 1956, it was attached to the 100th anniversary of the establishment of the feast of the Sacred Heart of Jesus by Pope Pius IX. The title is derived from Isaiah 12:3, a verse which alludes to the abundance of the supernatural goods given by Jesus. Haurietis aquas made the whole Church, and not merely the Jesuits, recognize the Sacred Heart as an important dimension a Christian spirituality.