Epiphany

1. (initial capital letter) a Christian festival, observed on January 6, commemorating the manifestation of Christ to the gentiles in the persons of the Magi; Twelfth-day.

2. an appearance or manifestation, especially of a deity.

3. a sudden, intuitive perception of or insight into the reality or essential meaning of something, usually initiated by some simple, homely, or commonplace occurrence or experience.
-Link

Never said any better than this: