Wiktionary
road to damascus
n. (context idiomatic English) An important point in someone's life where a great change, or reversal, of ideas or beliefs occurs.
WordNet
road to Damascus
n. a sudden turning point in a person's life (similar to the sudden conversion of the Apostle Paul on the road from Jerusalem to Damascus of arrest Christians)
Usage examples of "road to damascus".
Paul recovered his sight, after losing it in that blinding vision on the road to Damascus.
Aurens, it appeared, was on the road to Damascus, sweeping all before him.