It is interesting that Ben Franklin set himself a goal that was, almost by definition, unachievable.
Given that we are human beings, it is (highly!) unrealistic to believe that we will ever achieve Moral Perfection.
And yet we must die trying.
Our goals must be ambitious, lofty and inspiring in order to propel us towards action.
Otherwise we will get too comfortable in our comfort zone which is not where progress or development happens!