125. Q. When does the Church teach infallibly?
A. The Church teaches infallibly when it speaks through the Pope and the
bishops, united in general council, or through the Pope alone when he
proclaims to all the faithful a doctrine of faith or morals.

126. Q. What do you mean by the indefectibility of the Church?
A. By the indefectibility of the Church I mean that the Church, as
Christ founded it, will last till the end of time.

127. Q. In whom are these attributes found in their fullness?
A. These attributes are found in their fullness in the Pope, the visible
Head of the Church, whose infallible authority to teach bishops,
priests, and people in matters of faith or morals will last till the end
of the world.

128. Q. Has the Church any marks by which it may be known?
A. The Church has four marks by which it may be known: it is One; it is
Holy; it is Catholic; it is Apostolic.

129. Q. How is the Church One?
A. The Church is One because all its members agree in one faith, are all
in one communion, and are all under one Head.

130. Q. How is the Church Holy?
A. The Church is Holy because its founder, Jesus Christ, is holy;
because it teaches a holy doctrine; invites all to a holy life; and
because of the eminent holiness of so many thousands of its children.

131. Q. How is the Church Catholic or universal?