At the heart of catechesis: Christ
In catechesis "Christ, the Incarnate Word and Son of God,. . . Is taught - everything else is taught with reference to him - and it is Christ alone who teaches - anyone else teaches to the extent that he is Christ's spokesman, enabling Christ to teach with his lips. . . Every catechist should be able to apply to himself the mysterious words of Jesus: 'My teaching is not mine, but his who sent me.'"
Source: Catechism of the Catholic Church (Vatican.va)