When God created the universe, the life it contained was blessed. Yet the blessing was not given equally to all. The amphibians and birds were told one thing:
וַיְבָרֶךְ אֹתָם אֱלֹהִים, לֵאמֹר: פְּרוּ וּרְבוּ, וּמִלְאוּ אֶת-הַמַּיִם בַּיַּמִּים, וְהָעוֹף, יִרֶב בָּאָרֶץ – God blessed them saying, “Be fruitful and multiply; fill the waters of the seas, and multiply the land”. (1:22)
In contrast, mankind was told:
וַיְבָרֶךְ אֹתָם, אֱלֹהִים, וַיֹּאמֶר לָהֶם אֱלֹהִים פְּרוּ וּרְבוּ וּמִלְאוּ אֶת-הָאָרֶץ, וְכִבְשֻׁהָ – God blessed them; and God said to them to be fruitful and multiply; fill the land and conquer it… (1:28)
Both are blessed to be populous, yet man is given a personal instruction – וַיֹּאמֶר לָהֶם – spoken directly, and not just about them.
Rav Hirsch notes that nature serves God by its intrinsic existence. It cannot be otherwise because there is no deviation in how it relates to God; the laws of science and nature are fixed. Mankind however, is spoken to, and must choose to listen. Free will is the צלם אלוקים that distinguishes humanity from other creatures. Allowing instinct and nature to run wild is to surrender to the animal within, which is not the duty man is charged with; the charge is moral consciousness, and the freedom to choose to overcome the natural instinct:
The Netziv explains that the animal instinct within us must be channeled a particular way, as evidenced by the origin of humanity:
וַיִּיצֶר ה אֱלֹהִים אֶת-הָאָדָם, עָפָר מִן-הָאֲדָמָה, וַיִּפַּח בְּאַפָּיו, נִשְׁמַת חַיִּים; וַיְהִי הָאָדָם, לְנֶפֶשׁ חַיָּה – God formed man from the dust of the earth, and breathed into him a living soul, and the man became alive (2:7)
Animals are simply called נֶפֶשׁ חַיָּה – they are living things. But mankind is made of more – a blend of matter, fused with soul. With this equilibrium, man becomes truly “alive”. The word חַיָּה means alive, but it also means happy. The happiness is found in the balance. This is the instruction– וַיֹּאמֶר לָהֶם.
This is reflected in their respective developments too; a newborn calf can stand not long after birth, and while it will get bigger, it is born as it will always be; whereas humans are born helpless, defenceless, and pretty useless for a relatively large part of their lives.
The body is the container of the soul. The soul has to operate the system, or it withers away. Our choices are what make us human. Are your choices wise?