Epiphany (noun)

1. 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.
2. A Christian feast celebrating the manifestation of the divine nature of Jesus to the Gentiles as represented by the Magi.

Origin:

From late latin epiphany, from greek epiphaneia "manifestation, striking appearance" from epi- "upon" + phainein "to show".

Examples:

1. He had an epiphany about the true nature of love while watching a sunset.
2. The teacher's words were a turning point, a kind of epiphany for her.
3. He had an epiphany while staring at the Mona Lisa, he realized the true meaning of art.
4. The new year's resolution was a result of a epiphany he had while reflecting on his past year.
5. The Epiphany is celebrated in many countries on January 6th, as the day when the Magi visited Jesus.