It (Roman Church) firmly believes, professes, and proclaims that those not living within the Catholic Church, not only pagans, but also Jews and heretics and schismatics cannot become participants in eternal life, but will depart "into everlasting fire which was prepared for the devil and his angels" [Matt. 25:41], unless before the end of life the same have been added to the flock; and that the unity of the ecclesiastical body is so strong that only to those remaining in it are the sacraments of the Church of benefit for salvation, and do fastings, almsgiving, and other functions of piety and exercises of Christian service produce eternal reward, and that no one, whatever almsgiving he has practiced, even if he has shed blood for the name of Christ, can be saved, unless he has remained in the bosom and unity of the Catholic Church." (Council of Florence (1441), Pope Eugenius, Decree for the Jacobites, in the Bull Cantata Domino; Denzinger 714)
So this: "those not living within the Catholic Church, not only pagans, but also Jews and heretics and schismatics cannot become participants in eternal life."
Actually means this:
"Those who, through no fault of their own, do not know the Gospel of Christ or his Church, but who nevertheless seek God with a sincere heart, and, moved by grace, try in their actions to do his will as they know it through the dictates of their conscience - those too may achieve eternal salvation. "
That's impossible and absurd and anyone with a lick of sense knows these two statements directly contradict each other. But, hey, we can fudge all we want and change the meaning of words to keep up with the times, because we are the CC and we are infallible in doctrine! Good grief,, how can any thinking person accept such nonsense?