Christians therefore read the Old Testament in the light of Christ crucified and risen. Such typological reading discloses the inexhaustible content of the Old Testament; but it must not make us forget that the Old Testament retains its own intrinsic value as Revelation reaffirmed by our Lord himself.[105] Besides, the New Testament has to be read in the light of the Old. Early Christian catechesis made constant use of the Old Testament.[106] As an old saying put it, the New Testament lies hidden in the Old and the Old Testament is unveiled in the New.[107]