Kabbalah sa Isaias 64:4: Sha'arei Orah

Know and have faith that all who are destined to merit entering the Coming World-Olam HaBa-עולם הבא, will enter solely by way of judgement-Din. About this our sages, of blessed memory, said,¹⁹⁹Talmud Bavli, Rosh HaShanah 16b “On the Day of Judgement there will be three groups.”²⁰⁰That is, in the time of the resurrection and the coming world (see Rashi ibid.) there will be three categories of people. As it continues there, the first group consists of the perfectly righteous-Tzaddikim, the second group consists to totally wicked-Resha’im, and the third group consists of the intermediates-Beinonim. It is in that place that the righteous Tzaddikim will receive reward that is beyond all comparison, limitation and measure. About this our sages, of blessed memory, said,²⁰¹Talmud Bavli, Brachot 34b “Rabbi Chiyya bar Abba said that Rabbi Yochanan said, ‘All the prophets only prophesied about the days of Moshiach. However, about the Coming World-Olam HaBa-עולם הבא [it states],²⁰²Isaiah 64:4 ‘No eye has seen it O’ God-Elohi”m-אלהי״ם, except for You.’’”²⁰³That is, except for the Sefirah of Understanding-Binah, which is called God-Elohi”m-אלהי״ם, but written HaShem-יהו״ה, as mentioned before, no eye has seen it. Also see Zohar II 210b.

Our sages, of blessed memory, therefore said about the matter of Shabbat,¹²⁵Tractate Shabbat 10b “Even though it is meant to be revealed, its reward is not meant to be revealed.” This is because the reward of the coming world (Olam HaBa-עולם הבא) and its goodness is hidden, as it says,¹²⁶Isaiah 64:3 “Except for You God, no eye has seen it; what He will do for one who awaits Him.” It also says,¹²⁷Psalms 31:20 “How abundant is Your goodness that You have hidden for those who fear You, that You have done for those who find refuge in You.” According to this principle you should know that even though the Shabbat is revealed before us, its reward is not revealed, but is rather sealed and hidden. Moreover, not a single prophet prophesied about it and what it is, since it is the great goodness that has been hidden from the time of the six days of creation and no creature can behold it, other than HaShem-יהו"ה Himself, blessed is He.