This is a strange post that I came across out on the Quaker internet world.  It points to how legalistic Friends could (can) be.  My first impulse was to dismiss it as one of those overzealous scruples Friends embraced in the past and that we have outgrown.  After all, try getting through the day without saying "Good morning."  And I'm not recommending that we should embrace this as a testimony.  I do recommend reading it though and then think about the challenge it poses to being sincere in all of your speech, "to mean what you say and say what you mean."  You will start thinking about things you didn't notice before.

https://quakerlexicon.wordpress.com/2015/09/06/greeting-and-leave-taking/