The saying "Be kind, for everyone you meet is fighting a hard battle," in spite of the debate over its exact wording and attribution, is a profound truth. Every time we become frustrated by a minor inconvenience or less than optimal situation caused by a stranger, staying calm and gracious is best.
Photographer Amanda Crommett's series "Suffering the Silence" reinforces that notion with her photos of people who walk around looking as healthy as any other for the most part, yet are suffering from various diseases that are challenging to live with.
See the series in entirety here, and view the rest of Crommett's work at her website.