In Genesis 1:24, beasts signify the things of man's will or loves. (Arcana Coelestia 44, 46)

In Genesis 9:10, beasts signify all that was living in the man of the Ancient Church, and also what belonged to his new will; likewise the lower things of his understanding and the will therefrom. (Arcana Coelestia 1026-1029)

In Psalm 104:20, beasts signify affections longing to be instructed, or spiritually nourished. (Apocalypse Explained 650[10])

In Luke 10:35, since the beast was a donkey, this signifies to instruct another according to his capability. (Apocalypse Explained 1154)

The beast of the south (Isaiah 30:6) signifies people who are principled in the knowledges of good and of truth, but do not apply them to life and instead to science.

Every beast and creeping thing (Genesis 8:19) signifies the goodnesses of the internal and external man.

"Beasts" represent the affection for doing good things, a true desire to do them from the heart. In the negative sense, "beasts" stand for the lust to do evil.

The beast ascending out of the sea (Revelation 13:1) signifies reasonings from the natural man confirming the separation of faith from life.

(References: Apocalypse Explained 13, 773; Revelation 13:11)

The Tree of the Knowledge of Good and Evil is a meaningful symbol in the Bible: When Eve ate its forbidden fruit and gave it to Adam it signaled the fall of mankind. But beyond simple disobedience, why was it so significant, and why was the outcome so drastic? The Tree of Knowledge represents spiritual thinking that is based on our human senses and intelligence -- things we figure out for ourselves instead of getting from the Lord. That might not sound like such a bad thing, and to some extent it's not for us in the modern age. But the people represented by Adam and Eve were celestial, which means they were in a state of love to the Lord and received wisdom from Him directly. From the love they felt they knew instantly what was right and true and what was wrong and false. But on some level they wanted to live from themselves, not from the Lord, and started pushing away the Lord's leading and trusting in their own intelligence instead symbolized by eating of the Tree of Knowledge.

In Genesis 6:5, this signifies no will for good, and so no perception of good and truth. (Arcana Coelestia 586)

In Psalm 7:4, this signifies that the Lord is justice, and there is no evil in Him. (The Inner Meaning of the Prophets and Psalms 257)

In Genesis 19:19, this signifies the danger of being at the same time in evil and good. (Arcana Coelestia 2426)

In Matthew 6:13, evil is rejected by the angels until only good remains with no idea of evil; and this with a kind of indignation that evil should be thought of when the Lord is thought of. (Arcana Coelestia 3605[2])

In Isaiah 5:20, this signifies that the distinction should be acknowledged. (Apocalypse Explained 526[7])