Two wise men with deep insight into the mind share their thoughts. Hunger is the supreme disease.
Mental activity is the supreme suffering.
Depression can equally be regarded as an event of the mind. To speak or act with a defiled mind is to draw pain after oneself, like a wheel behind the feet of the animal drawing it. No, you won't go to hell for thinking bad thoughts. That's not how I read this passage, not in the context of the Buddha. If you have any doubts about this, just recall the last time you thought about that shrimp dip in the fridge and how long it remained there once the thought entered your head.