The Words We Speak: Filioque
The Catholic Church's teaching on the Filioque , the doctrine that the Holy Spirit proceeds from both the Father and the Son, can be summarized as follows: The Catechism of the Catholic Church affirms that the Holy Spirit proceeds from the Father and the Son (CCC 246). This is based on the Council of Florence in 1438, which explained that "the Holy Spirit is eternally from Father and Son; He has his nature and subsistence at once ( simul ) from the Father and the Son. He proceeds eternally from both as from one principle and through one spiration". The Catholic Encyclopedia further clarifies that this "dogma of the double Procession of the Holy Ghost from Father and Son as one Principle is directly opposed to the error that the Holy Ghost proceeds from the Father, not from the Son". This doctrine was first explicitly denied by heretics in the 7th century, but the Church has consistently affirmed the Filioque as part of its Trinitarian faith. The Catechism notes ...