Franklin jokes that creditors resemble a religious sect because they are unusually strict about observing particular days and times. The “set days” are repayment deadlines, which may seem less important to a debtor but remain highly significant to the person expecting to be paid. The humour rests on comparing financial punctuality with the careful observance of religious dates.

Beneath the joke is a practical warning about debt. Borrowing creates obligations that do not disappear simply because repayment is inconvenient or forgotten. Creditors have a direct interest in remembering when money is due, so debtors should expect deadlines to be enforced. Franklin’s broader point is that credit reduces financial freedom by attaching future income to fixed commitments. Anyone who borrows should therefore take repayment dates and terms seriously rather than assuming that creditors will treat them casually.