Cyrill of Alexandria
In response to frequent allegations against God and exhortations to love one's neighbors while distancing themselves from foreign women and the marriages prohibited by divine law, they irrationally questioned: “What does God desire if not offspring? For the commandment given to Moses states, ‘There shall not be barren, neither shall there be barrenness’ among the people of Israel (Exodus 23:26). To Abraham, the Almighty declared, ‘I will multiply thy seed as the stars of heaven’ (Genesis 22; cf. Exodus 32:13). This shows that the Divine intention emphasizes growth and progeny, ensuring that the grace of the promise made to Abraham is fully realized. God is indifferent to whether this occurs with foreigners or local women, as what has been promised will indeed come to pass.
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Thus it is written: ‘Say ye,’ says He, ‘why has the Lord witnessed between you and the wife of your youth, whom you have forsaken?’ If you wish to argue this for the sake of witness and question why He forbade the dismissal of a companion, I would say: consider that ‘she is your companion and the wife of your covenant,’ being one flesh with you (Genesis 2:23-24), and lives according to the law, as she was created by God in this manner. Additionally, she is, I believe, ‘the rest of his spirit,’ and the husband’s essence is entwined both physically and emotionally with the one bound in this covenant. Just as they are united as one body, they also become united in a certain sense as one soul, as love unites them and divine law fosters harmony amongst them. When he refers to the wife as a remnant of the husband’s spirit and a part of his soul due to their oneness, it indicates that through the harmony of love, they become unified. Therefore, do not charge God with being unreasonable, as if He unjustly rebuked those who reject the wife of their youth and sever the bond of covenant and spirit that unites them. I believe even the wise Paul, inspired by this understanding, wrote in his epistle to believers in Christ, ‘Are you bound to a wife? Seek not resolution’ (1 Corinthians 7:27). The Savior Himself taught: ‘If any man puts away his wife, except for the cause of fornication, he causes her to commit adultery: and whosoever shall marry her that is divorced commits adultery’ (Matthew 5:31-32; cf. Matthew 19:9). In addressing the Sadducees who inquired why ‘Moses commanded to give a certificate of divorce’ and separate from their spouses (Matthew 19:7), He replied: ‘Moses permitted it because of your hardness of heart; but from the beginning it was not so’ (Matthew 19:8) — for the One who created ‘male and female I created’ (Matthew 19:4) — ‘what God has joined together, let not man put asunder’ (Matthew 19:6).