John Chrysostom
The great fish not only spared the prophet Jonah but also preserved the sacred trust given to him. Numerous wonders within creation can be observed, which should lead those who idolize nature to understand that all things do not simply occur through nature's power, but are subject to the divine will of God. This will has brought forth creation and governs all that exists, either maintaining the established laws of nature or effortlessly altering them whenever it pleases, enabling them to act contrary to their usual course.
When Jonah was engulfed by the great fish, he emerged from the experience transformed, greater than he was before facing such peril.
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Jonah, in pursuing his own interests rather than considering the welfare of others, found himself near destruction: though the city stood, he was perilously tossed about, troubled by the storm, and nearly drowned; yet when he turned his focus to the good of others, he discovered his own salvation.
It begs the question, was Jonah’s time in the belly of the fish merely a dream? No, that cannot be asserted. Similarly, Christ's time in the depths of the earth was not a mere fantasy. The fulfillment of this proclamation and the essence of truth could not be an illusion. Thus, we celebrate the death of Christ in all things: in the sacraments, during baptism, and in every sacred rite. This is why the Apostle Paul proclaims emphatically, “I do not desire to boast, except in the cross of our Lord Jesus Christ” (Galatians 6:14). It is clear that those who adhere to Marcion's erroneous teachings are akin to children of the devil, for they obscure the very truth for which Christ offered Himself and against which the forces of evil resisted—namely, the cross and the suffering.
Jonah was cast out of the fish's belly onto the shores of Nineveh, just as Christ triumphed over death and rose again.