I found this Tumblr graphic (posted by mindful-minds) to be very insightful. It makes me think on the minor and major struggles I face day-to-day. It makes me want to learn from them, and to continue going up in life.
"What doesn't kill you makes you smarter," as Kelly Clarkson would say it.
Seriously, listen people. When someone's head is a mess, it is extremely difficult to magically be back to normal. It is plain dumb to tell someone suffering with a mental health illness to just "snap out of it." Mental healing is a process that takes time. Help someone out, by helping them....not belittling them.