Hide When Tempted to Show; Show When Tempted to Hide

This saying functions as a helpful litmus test of the purity of one's motivations for wanting to share information with someone. The idea is that if you are not sure if you should impart some piece of knowledge, ask yourself if you are too excited--hoping for a specific reaction--to achieve some sort of status for having done so. If the answer is yes, then you shouldn't, at least not right away. You get the idea.