An Australian mom named Justine Van Den Borne was out shopping with her daughter. When she was 35, Justine was diagnosed with Multiple Sclerosis, which is a degenerative illness that slowly degrades the lining around the nerve cells in your brain and spine. Many people who have MS end up in a wheelchair eventually, but the progression of the disease is different for everyone. You might not be able to tell someone has it by looking at them (like many diseases actually), and even someone standing on their feet could be in significant pain.

When Justine came back to her car, she found a message from some brave soul asking, "Did you forget your wheelchair???" Since the anonymous questioner had fled the scene, Justine decided to write this open letter on Facebook:

Sources: Justine Van Den Borne