When Oedipus solves the riddle of the Sphinx, the creature flings itself off a cliff to its death; conversely, his inability to solve the riddle of his own birth leads to his mother’s suicide and his own self-blinding and exile. Similarly, when in The Libation Bearers Orestes comes to kill his mother Clytemnestra and a servant cries out “The dead are killing the living!” — because Orestes was believed to be dead — Clytemnestra replies, “Ah, a riddle. I do well at riddles.” But she hasn’t done well: she never penetrated the riddling words of Cassandra, or she would not have acted as she did. And now her understanding of her own peril arrives too late to save her life.
The word there translated as “riddle” is ainigma. A form of that word appears also in the New Testament — only once, but in an especially famous verse, 1 Corinthians 13:12: “For now we see in a mirror dimly” — en ainigmati, in obscurity, enigmatically, as though riddled to — “but then we will see face to face. Now I know only in part; then I will know fully, even as I have been fully known.” The key point here, I think, is that this is not a condition we can remedy through our own efforts — not even the most ingenious. In order to “see face to face,” to “know fully,” we must wait along with the whole Creation which (paraphrasing the second half of Romans 8 here) awaits its deliverance from enslavement to decay. When we are all delivered, redeemed, when the expectation of the children of God is realized, when the “great mystery” — Ephesians 5:21, not just a mysterion but a mega mysterion! — of the marriage of Christ and his church is consummated in glory, all of that will happen as an unveiling, a revelation: apokalypsin (Romans 8:21).
–Alan Jacobs, Tolkein’s riddles