Macbeth feels guilty after killing Duncan this is shown when he says " will all great Neptune's ocean wash this blood/Clean from my hand" But soon after Macbeth forgets his guilt and continues doing evil, showing that guilt is an important feeling.
Everytime I think dark thoughts that can't be used towards my writing, I look at this saying and feel better. Maybe everyone goes to their high school reunion to have a before/after perspective on how it did get better.
Charlotte Perkins Gilman quote from Let us enquire what glory there was in an omnipotent being torturing forever a puny little creature who could in no way defend himself? Would it be to the glory of man to fry ants?