Let us illustrate. When Arnold's Light of Asia appeared, not a few Catholics joined in the chorus of fulsome praise which greeted it. How charming, how beautiful, how tender, how pathetic, how humane; what lofty morality, what exquisite sentiment! Now what was the real purport of the book and what was its essence? To lift up Guatama, the founder of Buddhism, at the expense of Jesus Christ, the Founder of Christianity!
..... Here was a work of literary merit, although it has been greatly exaggerated in this respect, praised extravagantly by some Catholics who, in their excessive desire to appear impartial, failed or refused to see in Edwin Arnold's Light of Asia a most vicious, anti-Christian book! What difference does it make whether a book be excellent in a literary sense or not, if its effect be the loss of souls and not their salvation? What if the weapon in the hands of the assassin be bright or not, if it be fatal? Though spiritual assassination be brilliant, it is nonetheless deadly.....
Si quis non amat Dominum Nostrum Jesum Christum, Sit anathema ["If anyone does not love the Lord Jesus Christ, let him be anathema"], says St. Paul. Liberal literature is the written hatred of Our Lord and His Church. If its blasphemy were open and direct, no Catholic would tolerate it for an instant; is it any more tolerable because, like a courtesan, it seeks to disguise its sordid features by the artifice of paint and powder?
Excerpts from Chapter 18 of Liberalism is a Sin by Fr. Felix Sarda Y Salvany
(Bolded emphasize is mine)