One of the explanations of this statement (in addition to those provided by the commentators) is that the education of schoolchildren has to be in a manner that the children are completely permeated and absorbed with the ideal of Moshiach. Just by looking at a Jewish child, what should one see? - Moshiach!
His entire being is "Moshiach" - i.e., the realization of "You have been shown... there is none beside Him."
...The idea is even more pronounced with respect to the school children of our generation who are called (and endorsed by Jewish leaders as) "Tzivos Hashem-the Army of G-d:"
The name Tzivos Hashem signifies that the children are totally devoted and subordinated to G-d, as (and even more than) the devotion of "soldiers" to their "general." It follows that Jewish children of our generation - boys and girls - possess in an even more revealed measure the status of Moshichoi, i.e., G-d's own anointed ones. This provides for the preparation and introduction that leads to the impending revelation of the general Moshiach of all Jews, with the true and complete Redemption.
And "As in the days that you left Egypt I shall you wonders:"
all the "Tzivos Hashem departed from the Land of Egypt,'
so, too, the "Tzivos Hashem" of our generation will depart from the present exile to the true and complete Redemption.
(From the talks of the night of Simchas Torah before Hakofos, 5752)
10. Michah 7:15. 11. Bo, 12:41.
