Answer: George
Just after George and Mary are wed, George notices that the Building and Loan is closed because a crowd of people want to get their money out. To appease them, Mary graciously offers to let the Building and Loan use their $2,000 worth of honeymoon money to tide the people over. At the end of the day, George says the quote above when he, Uncle Billy, Eustace, and Tilly put the last two dollars into the safe.