There is a Greek myth which can help us get some insight into what Libra's real life journey is about. The Greek myth of Tiresias, the blind prophet, also has some relation to Libra. It's a curious myth, and we'll deal here with only part of it, the part that really pertains to our curious subject.
Tiresias, because he has the favor of the goddess Hera, is given the chance to observe a miracle: two serpents coupling in the goddess' sacred grove. He asks the goddess which of them experiences the greater pleasure; and because she cannot answer, she grants him the boon of spending part of his life as a woman, so that he can experience both. At the end of this ritual of transsexual initiation, he returns to his male form and is called before Zeus and Hera and asked which experiences the greatest pleasure - male or female. At first he tries diplomacy, because whichever answer he gives he knows he is bound to offend somebody. But eventually he tells the truth - that the female experiences the greater pleasure - whereupon Zeus, furious at this insult to masculine vanity, strikes him blind.
Now, blindness in Greek myth is often a symbol for inner sight. All the great prophets and bards are generally represented as blind, either in one eye or both. Oedipus, when he makes his great discovery about his origins, strikes himself blind - that is, he sees inwardly at last. So, for Tiresias, the result of his experiences is that he now has inner sight, and becomes a prophet.
What has this got to do with Libra? Well, it's the polarity. Male and female are as enigmatic a pair for Libra as good and evil, or perfect and imperfect.