It is not medieval, but biblical for a Christian to realize when
considering the sacrament, that we are given the bodily Self of the
Lord... that we are given the possibility of addressing ourselves in
faith and love, in adoration and acceptance, to that Lord bodily present
to us... It is actually plain heresy to say (in theory and hence in
practice) that Jesus Christ in the Sacrament of the altar is not to be
honored with an external cult of adoration... that exposition is to be
rejected.
The Christian CommitmentKarl Rahner, S.J.