"The wolf also shall dwell with the lamb, and the leopard shall lie down with the kid; and the calf and the young lion and the fatling together; and a little child shall lead them. And the cow and the bear shall feed; their young ones shall lie down together: and the lion shall eat straw like the ox. And the sucking child shall play on the hole of the asp, and the weaned child shall put his hand on the cockatrice' den. They shall not hurt nor destroy in all my holy mountain: for the earth shall be full of the knowledge of the LORD, as the waters cover the sea." (Isaiah 11:6-9)
These verses describe the peace and security which will return to creation during the reign of Christ. Before man chose to sin against God, there was no death nor violence in creation. God gave Adam, Eve and the beasts of the earth the fruits of the field as food. Carnivores did not exist. Only after the sin of Adam and Eve did death and violence come upon the scene. After their consumption of the forbidden fruit, God immediately killed an animal and used its skin to cover the sin of Adam and Eve's nakedness (Genesis 3:21). After bringing Noah and his family through the great flood, the Lord introduced the fear of man into the animal world and gave to mankind the animals for food (Genesis 9:1-4). None of these things were intended in God's original design; they are the consequences of rebellion.
The human race has lived for so long in a sin-cursed world that the revocation of sin's curse is nearly impossible to imagine. Yet, in the millennial kingdom God will restore much of creation's early harmony. One cannot say that the curse will be lifted entirely, because the prophet Ezekiel speaks of the Millennium's citizens eating fish and offering memorial-sacrifices in the millennial temple (Ezekiel 47:10, 43:18-27). However, for all intents and purposes, this passage speaks of a peace and harmony in the world which has not been witnessed since the earliest days of creation.
Instead of having their young carried off by natural predators, the sheep and the goat will live in peace with those who were once their enemies. No trace of violence or danger will be seen as a small child guides both the lamb and the once-ferocious leopard like a shepherd would lead his flock.
As mentioned previously, in the beginning of creation, all living creatures were herbivores; therefore, the lion and other carnivorous beasts will return to the diet of vegetables and fruits for which they were intended.
An asp is a type of poisonous snake. Quite likely, this name refers to a cobra. Although a cockatrice typically refers to a mythical dragon-like creature, here it clearly refers to a type of poisonous snake or other reptile. In the present world, for anyone, especially a small child, to play on or near the den of a deadly snake would be unimaginable; but in the kingdom the danger of these creatures will pass away. The following verse explains why. It is because the earth will literally be full of the knowledge of God.
The holy mountain undoubtedly refers to the future Mount Zion which the millennial temple will occupy. As the Law of Christ goes forth from this temple and the world's inhabitants are taught by the very One Who created them, the knowledge of God will saturate the earth. The result? Peace, such as has not been in existence since the days of Adam and Eve, will flood the whole earth. Society teaches that liberation from the Law and knowledge of God brings peace while the following of God breeds hatred and violence. This is a lie which has been promoted by the powers of darkness. The Bible teaches the direct opposite. The more one knows and loves God, the more peace he will experience.