I posted this link once before when this topic came up.
A mate of mine who seemingly had the "perfect" life is suffering deep depression and talking about how he/we would be better off if he was gone.
Another mate who has been his "go to friend" when he needs help showed me this short youtube clip that helps those of us who can only say things like "he never showed signs of being depressed" or "what's he got to be depressed about" or "he needs to toughen up a bit!" and the usual things we all say when we have never had the deep depression that quite a few people have - many more than we all think....
It's a short clip so have a look.....