By St. Alphonsus Liguori, The Catholic Thing - What is blasphemy? It is the uttering of language injurious to God; it is, according to the definition of theologians, “contumeliosa in Deum locutio ;” or, contumely against God. God! whom does man assail when he blasphemes? He directly attacks the Lord. “He hath strengthened himself against the Almighty.” (Job. xv. 25.) Are you not afraid, blasphemer, says St. Ephrem, that fire will come down from heaven and devour you?