Symbols.

Palm Sunday at the Vatican
They celebrate with palms;
With reverence bows each holy man,
And chaunts the ancient psalms.
Those very psalms are also sung
With olive boughs in hand,
While holly, mountain wilds among,
In place of palms must stand:
In fine, one seeks some twig that's green,
And takes a willow rod,
So that the pious man may e'en
In small things praise his God.
And if ye have observed it well,
To gain what's fit ye're able,
If ye in faith can but excel;
Such are the myths of fable.