It's fine, but when you use a fraudulent source to exclaim that Lincoln was against the banks, even though he was promoted by the Whigs and radical republicans and was the forerunner for the permanent public debt banking system, that he himself promoted, it calls into question your research. The letter is fake and it makes no sense why authors continue to make Lincoln out to be anti-Usury. They still hold to the concept of banking and wanting banks but with better regulations such as public banking. They never seem to talk about holding houses at post offices and silver certificates or other concepts of a medium of exchange that does not rely on banking.