The correct answer to this open question is the following.
Although there are no options attached we can say the following.
Franklin wrote that there was something more powerful than his intention to live virtuously. What was that more powerful thing?
Answer:
The human propensity to live the opposite habits that were against the 13 virtues he considered essential to people's lives. Those things were not virtuous for people.
That is why he came up with 13 virtues he considered necessary in every people's life. We are talking about Resolution, Silence, Order, Temperance, Sincerity, Industry, Frugality, Cleanliness, Moderation, Justice, Humility, and Chastity:
Benjamin also wrote that it could be impossible to get these all virtues all the time but that people should aspire to have them all in different moments of their lives to have a decent and good way of living.