An extract from 'Francis S. Betten, S.J. - The Roman Index of Forbidden Books'
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'Moreover, to be a trustworthy guide, the Church must state the truth clearly and unmistakably. The faithful are not guided by ambiguous circumlocutions, by terms that may be understood in two or perhaps more ways. Neither may she keep exclusively in the lofty heights of theory; but she must instruct with regard to the facts of everyday life. The dangers arising from books are concrete not abstract, and they must be met by concrete measures. This can be done effectively only by an energetic and unmistakable "thou shalt not" which makes men realize that they are "under authority." No one has ever stated the truth more clearly, more unmistakably than Christ our Lord. Was it not precisely for this very fact that "many of His disciples went back and walked no more with Him"? (John 6, 67.)'