John Chrysostom
The divine favor bestowed upon these creatures is that they should reproduce abundantly. Since they were designed as living beings, it delighted the Creator that they endure perpetually. Therefore, it is noted, "And God blessed them, saying, Be fruitful and multiply." This divine proclamation has safeguarded their existence up to this present time; despite the passage of ages, their kind has not diminished. The blessing from God, encapsulated in the command to "Be fruitful and multiply," has empowered them to sustain their lineage without interruption.
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Why, one may wonder, did God not extend a blessing to the stars upon their creation? What of the plants and trees that were also left without His blessing? There exists a distinction between these creations, and understanding it is essential. The stars, as originally set forth, have remained unchanged; they do not grow in number or size, existing eternally in their fixed positions, therefore requiring no blessing for multiplication. In contrast, those beings that are designed to grow through succession necessitate a blessing to ensure their continuation.
Let me reiterate this concept for clarity, dear brethren. Even a seed planted thoughtlessly in soft soil will not achieve stability; only when it is sown deep and with care does it thrive. The stars were not in need of a blessing, as this would not permit them to multiply. Conversely, birds, fish, and humanity required such a blessing for their ongoing creation. In contexts where small things progress and develop, and where no being may flourish except through generational succession, there lies the necessity of blessing.
Having understood the rationale behind the blessings bestowed upon these creatures, we can now reflect on further Scriptural insights. “Grow,” as they were initially few; “multiply,” because their numbers were not great; “fill the waters,” as they occupied but a portion of the vastness. There will be an occasion to revisit why only fish, birds, and humans were honored with blessings, unlike other animals. For now, we shall adhere to the intended order of discussion.