This isn't a specific quote or anything, but some people insist that a positive attitude can fix all your problems and make life peachy. No. A positive attitude won't bring back lost loved ones, change your financial situation, or suddenly make you into a happy go-lucky problem solver. Sure, it may work for some people, but there are plenty of people that it fails for and even leads to worsening depressing or other mental disorders.
It's something that's always irked me, especially with all the recent "Strong" movements like "Boston Strong" and "Stronger than the Storm" (after the hurricane in New Jersey). People are admired for staying strong after losing something dear to them, whether it's a limb, a family member, or their home. People who grieve are not, despite their actions being incredibly understandable. If I lose my legs, I'm not going to embrace the new me. I'm going to be depressed as fuck because I'm, you know, missing my fucking limbs. And yet I see people looked down upon for such a thing. I dunno, the general concept has always bothered me.