The quotation is from Fr. Jean-Baptiste Henri Lacordaire,OP (1802-1861). I was reading it from the North American College Manual of Prayers. "Thou Art a Priest Forever"
To live in the midst of the world with no desire for its pleasures; to be member of every family, yet belonging to none; to share all sufferings; to penetrate all secrets, to heal all wounds; to go daily from men to God to offer Him their homage and petitions; to return from God to men to bring them His pardon and hope; to have a heart of fire for charity and a heart of bronze for chastity; to bless and to be blest forever. O God, what a life, and it is yours, O Priest of Jesus Christ!