In "A Christmas Carol,"� What Causes Ebenezer Scrooge To Change His Ways?

Charles Dickens's Scrooge, possibly the most famous miser in literature, regards Christmas as "Humbug!" and furiously resents having to pay his clerk, Bob Cratchit, one day's Christmas holiday pay. One Christmas Eve, he is visited by the ghost of Jacob Marley, his old business partner, and three spirits: Christmas Past, Present and Future. The spirits remind him of what he has already lost by his selfish ways, and then show him his own death – unlamented and alone – as well as that of Bob's invalid son Tim, denied the care he needs because Scrooge pays his father starvation wages.
Scrooge is transformed by these visions. Next morning he sends a huge turkey to the Cratchit family, goes to visit the relatives whom he has been ignoring for years, and starts a new life as a philanthropist, much loved in the community. We are also told that "to Tiny Tim, who did NOT die, he was a second father."

I happened because he saw what happened in the present future and the past