Be good, but try to let no one know it- Tolstoy
I found this quote in the text of some of Tolstoy's personal "Rules of Life". He wrote them when he was 18 years old. There are quite a few others, but it got me thinking. I assume he didn't mean that you shouldn't let anyone see your good side. I believe he meant that one shouldn't be a braggart when it comes to how "good" they are. Perhaps he meant that he aspired to carry himself with humility.
Do you have your own "Rules of Life"?