Benjamin Franklin's statement on the last day of the Constitutional Convention is one of the best expressions I have encountered of this humility of thought:
"I confess there are several parts of this constitution which I do not at present approve....But I am not sure I will never approve them. For having lived long, I have experienced many instances of being obliged by better information or fuller consideration, to change opinions even on important subjects, which I once thought right, but found to be otherwise. It is therefore that the older I grow, the more apt I am to doubt my own judgment, and to pay more respect to the judgment of others. Most men indeed as well as most sects in religion, think themselves in possession of all truth, and that wherever others differ from them it is so far error.... In these sentiments, Sir, I agree to this Constitution with all its faults, if they are such."
Franklin famously believed America could preserve our republic only if the people could live with civic and personal virtue. Adopting an appropriate humility toward one's personal beliefs, along with an appropriate respect for the beliefs of others, is the first step toward this ideal of virtue.