This letter affirms the preeminence of the Council of Nicaea's doctrinal definitions and warns against the influence of synods held at Ariminum, which are accused of heresy and deviation from Nicene orthodoxy.
It emphasizes that the Nicene creed, especially the affirmation of the Son's coessentiality with the Father, is rooted in Scripture and essential to true Christian faith, contrasting it with the heretical and erroneous statements of the Ariminum synod.
The letter concludes with a call for unity in maintaining the Nicene doctrine, condemns those like Auxentius of Milan who promote heresy, and underscores the importance of confessing the Holy Trinity as defined at Nicaea.
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