The Catholic Church has never said it contains the ONLY truth, just the FULLNESS of Truth that God has given to mankind through Jesus Christ. Even as far back as the second century, Church Fathers recognized that truth existed in "protoevangelium" form among the Greek philosophers and their recognition of the Logos.
Regards
I see. So the only truth that there is in the world outside of the Catholic Church is Greek philosphy. Is that right up to today re Greek philosophers?