"R' Yochanan said: Three keys the Holy One blessed be He has retained in His own hands and not entrusted to the hand of any messenger, namely, the Key of Rain, the Key of Childbirth, and the Key of the Revival of the Dead"
We might very well credit Rabbi Yehudah Liva, the legendary "Maharal of Prague," with being the first to "open the gate" and provide us with a truly penetrating look at the essence of the Sages' homiletical teachings on the Torah - the "Midrash."