Paraphrasing a discourse of the Lubavitcher Rebbe from parshat Beshallach:
When the Jewish people went through the parting of the Sea, they were able to perceive G-d's presence so clearly that they were able to point with their finger and say, "This (zeh) is my G-d." Even this, however, will not compare with our ability to experience G-dliness in the Messianic Age, when there will be an incomparably higher revelation. For G-d has told the Jewish people, "At the parting of the Sea you said,
this' (zeh) only once, but in the Messianic Age you will saythis' (zeh) twice, as we find in the prophecy Isaiah (25:9), "You will say on that day, `Behold this (zeh) is my G-d. We have trusted Him and He has redeemed us; this (zeh) is G-d who we have trusted, let us rejoice and be happy in His redemption.' "