What does Zechariah 12:10 mean?

Then I’ll pour out a spirit of kindness and prayer on David’s family and the people of Jerusalem. They’ll look at the one they pierced and mourn for him like you mourn for an only child, grieving deeply as you would for your firstborn. Zechariah 12:10 - Modern Text Bible

(God will move people’s hearts to grieve over the one they’ve hurt, leading to deep sorrow and repentance.)