 John Paul II used the metaphor to "the Church", which for him was not some amalgam of the Catholic and Eastern Orthodox Church, but the Catholic Church itself, thus indicating that the Catholic Church must avail itself of the traditions of both Eastern Christianity and Western Christianity.The Catholic Church uses this metaphor to compare the Latin Church's tradition to the Eastern Orthodox Churches' traditions and also Eastern Catholic Churches' traditions, as emphasized in the Second Vatican Council's ', the decree on Eastern Catholic Churches.John Paul II elaborated the metaphor, in "" (1990), "the Church itself, gathered in the one Spirit, breathes as though with two lungs of the East and of the West and that it burns with the love of Christ in one heart having two ventricles."