Commentary on Deuteronomy
Gregory of Nyssa (335–394)
Wherefore [Scripture] says, "The Lord God is one Lord." By the word Godhead it proclaims too the only-begotten God and does not divide the unity into a duality so as to call the Father and the Son two gods, although each is called God by holy writers.
If one does not love God with all his heart and with all his soul, how can he care wholesomely and guilelessly for the love of his brothers, since he is not fulfilling the love of the One on whose account he has a care for the love of his brothers? The person in this condition, who has not given his whole soul to God and has not participated in his love, the craftsman of evil finds disarmed and easily overpowers. .
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