The Pope on those who reject Catholic teaching.
"The fourth Evangelist - explained the pope - relates the reaction of the people and disciples, shocked by the words of the Lord, to the point that many, after having followed him until then, exclaim: ‘This saying is hard; who can accept it?' (V. 60). And from that moment on ‘many of his disciples returned to their former way of life and no longer accompanied him' (v. 66). Jesus, however, does not lessen his claim, indeed, he directly addresses the Twelve saying: 'Will you also go away?' (V. 67).
"This provocative question - continued the pope - is not only addressed to listeners of the time, but to believers and men of every age. Even today, many are 'shocked' by the paradox of the Christian faith. Jesus’ teaching seems too 'hard', too difficult to accept and put into practice. As a result there are those who reject and abandon Christ; those who attempt to 'adapt' his teachings to the fashions of the times distorting its meaning and value. 'Will you also go away?'. This unsettling provocation resounds in our hearts and awaits a response from each one of us. Jesus in fact is not contented by a merely superficial or formal belonging, an initial and enthusiastic adhesion is not enough for Him; on the contrary, we must take part in 'his thinking and his will' throughout our entire life. Following Jesus "fills hearts with joy and the full meaning of existence, but it also brings difficulties and sacrifices because very often it means going against the trend”. - Source