Kabbalah sa Isaias 11:9: Zohar, Kuntres Mattan Torah, Sha'arei Orah & Da'at Tevunot

Then R. Abba put his hands on his head, wept again, and said: ‘The light of the Torah now reaches the highest throne in heaven. But who will light the lamp of the Torah when the Master shall have passed away? Woe to the world which will be orphaned without thee. However, the words of the Master will shine in the world until King Messiah appears, when ” the earth shall be full of the knowledge of the Lord as the waters cover the sea” (Isa. 11, 9).’

The general is the entire humanity that must, under absolute obligation, eventually reach this grand evolutionary state, as said, “for the earth shall be full of the knowledge of the Lord, as the waters cover the sea” (Isaiah 11:9), “and they shall teach no more every man his neighbor, and every man his brother, saying, Know the Lord; for they shall all know me, from the least of them to the greatest of them” (Jeremiah 31:34), and also, “yet your teacher shall not withdraw himself any more, but your eyes shall see your teacher” (Isaiah 30:20).

The Song of Obstructions,⁹Psalm 91 which is founded on this principle, thus states, “He who sits in the refuge of the Most High, dwells in the shade of the Almighty. I will say of HaShem-יהו"ה, He is my refuge and my fortress; my God in whom I trust. For He will deliver you from the ensnaring trap, from devastating pestilence. He will cover you with His pinion and you will be protected under His wings; His truth is shield and armor. You shall not fear the terror of night, nor the arrow that flies by day, nor the pestilence that walks in gloom, nor the destroyer who lays waste at noon. A thousand may fall victim at your side and a myriad at your right hand, but it shall not reach you. You will only glance with your eyes and behold the retribution of the wicked etc.”¹⁰This Psalm and the various legions of destructive forces described by each of the terms in this Psalm are elucidated at greater length in Derech Chayim of Rabbi DovBer of Lubavitch, the Mittler Rebbe, translated as The Path of Life.