The principle of "fidelity to God and fidelity to man" leads to an avoidance of any opposition or artificial separation or presumed neutrality between method and content. It affirms, rather, their necessary correlation and interaction. The catechist recognizes that method is at the service of revelation and conversion 4Cf. CT 52. and that therefore it is necessary to make use of it. The catechist knows that the content of catechesis cannot be indifferently subjected to any method. It requires a process of transmission which is adequate to the nature of the message, to its sources and language, to the concrete circumstances of ecclesial communities as well as to the particular circumstances of the faithful to whom catechesis is addressed. Because of its intrinsic importance both in tradition and in present day catechesis, mention must be made of the method of approaching the Bible,5Cf. Pontifical Biblical Commission, The Interpretation of the Bible in the Church, l.c.. of "documentary pedagogy", especially of the Creed, since catechesis is a transmission of the faith; 6MPD 9. of the method of liturgical and ecclesial signs; and of methods proper to the mass media. A good catechetical method is a guarantee of fidelity to content.