When they went to the mountain with Moses, "And upon the nobles of the children of Yisrael he laid not His hand." The verse says "and did eat and drink," and Rabbi Yosi explains that this means they fed their eyes with the light. Rabbi Yehuda adds that they ate actual food and fed from the light and thus connected themselves above. Rabbi Elazar says that Yisrael was proper at that time and the Shechinah was bound to them. And in the future days the Holy One, blessed be He, will reveal Himself to His children and all will see visually His glory.