I’m sure it did not come as a surprise to either St Basil of Caesarea or St Gregory of Nyssa. Once they began to elucidate the mystery of the Trinity by means of the analogy between three human beings and the one nature that they share, it was only a matter of time before their opponents would accuse them of proclaiming three gods. Basil unsuccessfully responded to the accusation in his homily On Not Three Gods. Gregory offered a more compelling response in his important treatise Ad Ablabium: On Not Three Gods: the Father, Son, and Spirit are one God because they are the joint subjects of one indivisible activity.
But before analyzing Gregory’s rejoinder to the charge of tritheism, I’d first like to discuss one of Basil’s letters to Amphilochius. Basil is responding to a Eunomian criticism that the Orthodox do not know the God whom they worship:
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