Situational irony
Rev. Mark confirms that he knows Sowerby and Harold are fraudsters. Ironically, Rev. Mark accepts to guarantee them a loan of $900 despite knowing that they are likely to default. When the repayment time comes, Sowerby and Harold disappear, leaving Rev. Mark with the burden of repaying a loan that did not benefit him.
Disregard of Lufton’s counsel.
Lady Lufton has good intentions when she advises Rev. Mark to be patient in his ministry. In addition, Lady Lufton advises Rev. Mark to be cautious of the people he interacts with in town because they defrauded her husband in previous years. Ironically, Rev. Mark intentionally disregards Lady Lufton’s advice when he starts a friendship with swindlers who mess up his life.
Verbal irony
Sowerby tells Rev. Mark that he never fails to pay his debts because that is his obligation. However, he means the opposite because he has a criminal record of defaulting on bank loans. Even daily newspapers have severally confirmed that Sowerby and his team are imposters who use innocent people as guarantors in their loans, which they never pay.