They will not cause any harm Or any ruin in all my holy mountain, Because the earth will certainly be filled with the knowledge of Jehovah! ???????

[Bible Speaks]

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Isaiah 11:9

9 They will not cause any harm, Or any ruin in all my holy mountain, Because the earth will certainly be filled with the knowledge of Jehovah, As the waters cover the sea."

Security. ??????????

In the prophecy recorded at Isaiah 11:6-9, we find a delightful picture of harmony and peace—between wild animals on the one hand and humans with their domestic animals on the other. Does that picture find a spiritual fulfillment today? Yes! In verse 9, we learn why it is that such creatures will cause neither harm nor ruin: “Because the earth will certainly be filled with the knowledge of Jehovah as the waters cover the sea.”

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Does “knowledge of Jehovah” change the behavior of animals? No, it is people who are transformed by coming to know the Most High God and learning to imitate his peaceful ways. 

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Security.

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At long last, the heartwarming word picture painted at Isaiah 11:6-9 will see a complete fulfillment even in a literal sense. Men, women, and children will be safe and secure wherever they go on earth. 

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No creature, whether human or animal, will pose any threat. Imagine a time when you will see this entire planet as your home, where you can swim in the rivers, lakes, and seas; traverse the mountain ranges; and roam the grasslands in complete safety. And when night falls, you will not worry. The words of Ezekiel 34:25will come true, so that it will even be possible for God’s people to “dwell securely in the wilderness and sleep in the forests.”

https://wol.jw.org/en/wol/d/r1/lp-e/1102014264?q=isa+11%3A9&p=par