18 And from what did the Greeks derive the oracles of their oaks except from their thinking that the support of their sylvan food was the gift of heavenly religion? For such do they believe to be the gifts of their gods. Who but heathen people worshipped the trees of Dodona, when they gave honour to the sorry food of the woodland? It is not likely that their gods in anger inflicted on them as a punishment that which they used when appeased to confer as a gift. And what justice would there be if, being grieved that support was refused to a few priests, they denied it to all, since the vengeance would be more unbearable than the fault? The cause, then, is not adequate to bring such suffering on a failing world, as that the full-grown hope of the year should perish suddenly while the crops were green.
Source: Letters (New Advent)