And God said, “Let the earth produce each living soul according to its kind: the beast, and that which moves, and the wild animal of the earth, each according to its kind”; and so it was done. And God made each wild animal of the earth according to its kind, and each beast according to its kind, and every animal creeping on the ground according to its kind. And God saw that it was good.
Like the earth, we are unable to produce any good unless we have first been sown with religious insights, which enable us to see what to believe and do.
The role of the understanding is to hear the Word, while the role of the will is to do it. To hear the Word and not act is to claim we believe it although we do not live by it. People who act like this separate the two and split their minds. The Lord says they are stupid:
Everyone who hears my words and does them I compare to a prudent man who built his house on rock. But everyone who hears my words and does not do them I compare to a stupid man who built his house on sand. (Matthew 7:24, 26)
What the understanding grasps is symbolized, as shown, by creeping animals that the waters cause to creep out and birds flying over the land and over the face of the expanse. What the will is intent on is symbolized by the living soul that the earth is to produce, by the beast and that which creeps, and by the wild animal of the earth.
People who lived in the earliest times used the same kinds of symbols for the contents of the understanding and the will. In consequence, the different types of creature have a similar representation in the prophets and throughout the Old Testament Word.
Beasts are of two kinds: bad (because they are dangerous) and good (because they are tame). Bad animals—bears, wolves, and [feral] dogs, for instance—symbolize evil things in us. Good animals—young cattle, sheep, lambs—symbolize the good, gentle things in us. Because the present theme concerns people who are being reborn, the beasts in this verse are the good, tame ones, symbolizing feelings of affection.
The traits in us that belong to a lower order and rise more out of our body are called the wild animals of the earth; they are cravings and appetites.
from Regeneration, Pages 147, 148