Tertullian,
Ante-Nicene Fathers Vol. III, Apologetic…
(1885)
“ You will not, however, deny that all beasts of burden, and not parts of them, but the animals entire, are with their goddess Epona objects of worship with you. It is this, perhaps, which displeases you in us, that while your worship here is universal, we do homage only to the ass. Then, if any of you think we render superstitious adoration to the cross, in that adoration he is sharer with us. If you offer homage to a piece of wood at all, it matters little what it is like when the substance is the same: it is of no consequence the form, if you have the very body of the god. ”
