-Song of Songs 3:10
The rabbis of antiquity wondered why God needed the Mishkan (the Tabernacle in which God's presence rested). God's presence fills all the world, so what is the Mishkan for? We ask the same question when we ask questions like, "What do we need a synagogue for? Why do we need any kind of religious institution to find God? Isn't God everywhere?" One answer comes from a midrash on Song of Songs (Shir HaShirim Rabba 3:20):
Rabbi Yehoshua of Siknin said in the name of Rabbi Levi: To what can the Ohel Mo’ed be compared? To a cave adjoining the sea, which the sea overflows when it becomes rough. Though the cave is filled, the sea loses nothing. So the tent of meeting was filled with the glory of the divine presence, and yet the world lost nothing of the Shechinah [God's felt presence].
There is nothing intrinsically special about the Mishkan (called the Ohel Mo'ed, "Tent of Meeting," in this passage), just as there is nothing intrinsically special about a synagogue. God doesn't need a special place. We do. We need a place to notice God, like we notice the sea filling a cave on the craggy shores of the sea. The sea is always there, but we fail to notice. We fail to notice God in our lives until we set aside a place that we make special for the purpose of experiencing wonder.