16 And yet how can you assert the falsehood of this story, when the very rites which you celebrate throughout the year testify that you believe these things to be true, and consider them perfectly trustworthy? For what is the meaning of that pine which on fixed days you always bring into the sanctuary of the mother of the gods? Is it not in imitation of that tree, beneath which the raging and ill-fated youth laid hands upon himself, and which the parent of the gods consecrated to relieve her sorrow? What mean the fleeces of wool with which you bind and surround the trunk of the tree?
Is it not to recall the wools with which la covered the dying youth, and thought that she could procure some warmth for his limbs fast stiffening with cold? What mean the branches of the tree girt round and decked with wreaths of violets? Do they not mark this, how the Mother adorned with early flowers the pine which indicates and bears witness to the sad mishap? What mean the Galli with dishevelled hair beating their breasts with their palms? Do they not recall to memory those lamentations with which the tower-bearing Mother, along with the weeping Acdestis, wailing aloud, followed the boy?
What means the abstinence from eating bread which you have named castus? Is it not in imitation of the time when the goddess abstained from Ceres' fruit in her vehement sorrow?
Source: Against the Heathen (New Advent)