Different opinions from the sages on the length of the "messianic era": 40 years? 70 years? 3 generations? Or Rabbi Hillel's shocking statement that the messiah has already come and gone, as per fulfilling the prophesies in the era of Hezekiah, king of Judah. Also, the distinction between the messianic era and the World to Come, with prophecy being primarily about the former. But the key question regarding the messianic era and how different it may be from the current world is also significant. Plus, the famous statement that ba'alei teshuvah (returning penitents) are closer to God even than the righteous. And then Eden (the Garden on the outskirts, perhaps) is another place... but the prophets can't prophesy about that which they've never seen. Also, Rabbi Akiva encourages everyone to review their Torah studies, regularly and repetitively. Plus, people are created for work, and your work should be Torah.