These ancients understood this well: the baptisteries
themselves were constructed outside the church to express this concept. They were
buildings which had the form of tombs, eight-sided or six-sided, as was usual
for a mausoleum. When, on the night of Holy Saturday, Christians saw the baptised
entering the baptistery with their clothes, they thought of this. The catechumens
were about to die: thus they entered to die, to put off the old life, to die and
then to rise again. In the morning they came out from there, dressed in white,
the sign of the new life. This was a way of thinking which must have meant a lot
to early Christians, even in Trastevere.

