Answer:
The <em>passion </em>that the author is referring to is Scrooge's passion for greed and money.
This passion can be seen in Scrooge's present state, when he denies helping his 'Poor family' regardless of the wealth he holds.
Explanation:
'A Christmas Carol' is a novella written by Charles Dickens. The story is about Ebenezer Scrooge, a greedy and selfish man who does not pay regard to someone's feelings or emotions. For whom money is the only business. But Scrooge was taught lesson by his old <em>friend </em>Jacob Marley's ghost on the eve of Christmas.
In the novella, when the author talks about Scrooge's passion, he is talking about his passion for greed and money. Scrooge just want to money, a lot of money and keep it for himself. He does not pay bonuses to his employees and does not grant them leaves either on holidays, such as Christmas.
This passion of Scrooge can be seen in his present state when he denies to help his poor extended family. Scrooge never married but her sister's family, his nephew Fred were in a state in poverty. Seeing his nephew's financial state, Scrooge never lended his help to them nor to anyone.