There are three things extremely hard: steel, a diamond, and to know one’s self.

There are three things extremely hard: steel, a diamond, and to know one’s self.

Benjamin Franklin

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2017 October 27	Link: https://books.google.com/books?id=1DsoBQAAQBAJ&pg=PT11&dq=There+are+three+things+extremely+hard:+steel,+a+diamond,+and+to+know+one%27s+self.+benjamin&hl=en&sa=X&ved=0ahUKEwjAmKvC9ZbVAhWLurwKHU58CO4Q6AEIUzAJ#v=onepage&q=%22There%20are%20three%20things%20extremely%20hard%3A%20steel%2C%20a%20diamond%2C%20and%20to%20know%20one's%20self%22&f=false	Image evidence

American author, printer, political theorist, politician, postmaster, scientist, inventor, civic activist, statesman, and diplomat

January 17th, 1706 - April 17th, 1790