Catholic Christians believe that the promise of the Spirit of

Truth to guide believers in truth is found in the constant faith

of the Church preserved in the writings of the Apostolic Fathers.

The term "Apostolic Fathers" applies to certain disciples and

successors of the twelve apostles. In a more restricted sense,

the term is applied to a group of

Greek-language writers who

were among the martyrs and major

figures of the 1st and 2nd centuries

in the Christian Church.