"The bonds which bind men to the Church
in a visible way are
profession of faith,
the sacraments, and
ecclesiastical government and communion.
He is not saved, however, who,
though part of the body of the Church,
does not persevere in charity.
He remains indeed in the bosom of the Church,
but, as it were, only in a 'bodily' manner
and not 'in his heart.'
All the Church's children should remember
that their exalted status is to be attributed
not to their own merits
but to the special grace of Christ.
If they fail moreover to respond to that grace
in thought, word and deed,
not only shall they not be saved
but they will be the more severely judged."
Second Vatican Ecumenical Council,
Dogmatic Constitution on the Church, 14.