The message of catechesis is “A message proclaiming salvation,” as the section 101-102 is headed.
140. When the fullness of time had come God sent his Son, Jesus Christ, to humanity. He brought to the world the supreme gift of salvation by accomplishing his redemptive mission in a manner which continued “the pedagogy of God”, with the perfection found in the newness of his Person. In his words, signs and works during his brief but intense life, the disciples had direct experience of the fundamental traits of the “pedagogy of Jesus”, and recorded them in the Gospels: receiving others, especially the poor, the little ones and sinners, as persons loved and sought out by God; the undiluted proclamation of the Kingdom of God as the good news of the truth and of the consolation of the Father; a kind of delicate and strong love which liberates from evil and promotes life; a pressing invitation to a manner of living sustained by faith in God, by hope in the Kingdom and by charity to one’s neighbour; the use of all the resources of interpersonal communication, such as word, silence, metaphor, image, example, and many diverse signs as was the case with the biblical prophets. Inviting his disciples to follow him unreservedly and without regret, (Cf. Mk 8:34-38; Mt 8:18-22) Christ passed on to them his pedagogy of faith as a full sharing in his actions and in his destiny.
One of the more lyrical passages in the GDC. But the essence of God’s communication to us, and formation of his people is through human means, as described above.