John Chrysostom
Here is the paraphrased text:
This is what he expresses concerning a wife in a sacred union: Why abandon your partner and seek the one who stands against you? Why turn from the companion in your journey and give satisfaction to the one who disturbs your peace? The former is your ally and flesh, while the latter is a dangerous weapon. Therefore, dear ones, avoid infidelity, both for the troubles it brings now and for the consequences that await.