“There was a sudden and wonderful change in his soul.” What brought about the change in Soapy?

On his way back to Madison Square, Soapy stopped outside his old childhood home.

The place reminded him of his childhood days when he led a happy and honest life with his mother and friends. The soft light shining from his living room’s window and the sweet music brought about a sudden change in his soul and he realised at the moment that the life he was living was worthless and hopeless and that he should put in efforts to change his life.