Archbishop Lefebvre called it the "great betrayal" (They Have Uncrowned Him, p. 107). He was speaking of Catholic liberalism, the attempt to reconcile the Church with the revolution. He explains himself: "there is liberal Catholicism (a term that I use with repugnance, because it is a blasphemy) a betrayal of the principles which it disavows, a practical apostasy of the Faith in the social kingship of Our Lord Jesus Christ" (Ibid, p. 109).

The importance of this book can be measured by these words of Archbishop Lefebvre:

"Yes, truly, Vatican Council II is the ratification of liberal Catholicism. And when it is remember that Pope Pius IX, 85 years earlier, said and repeated to those who were visiting him in Rome: 'Be careful!' There are no worse enemies of the Church than the liberal Catholics! - then can be measured the catastrophe that such liberal Popes and such a council represent for the Church and for the reign of Our Lord Jesus Christ!" (Ibid, p. 222).