I wouldn’t call him a fully sane person, especially in his later work (he suffered in later life from mental problems most often attributed to neurosyphilis, and it shows), but he has a much worse reputation than I think he really deserves. I’d recommend Genealogy of Morals and The Gay Science; they’re both laid out a bit more clearly than the works he’s most famous for, which tend to be heavily aphoristic and a little scattershot.
I wouldn’t call him a fully sane person, especially in his later work (he suffered in later life from mental problems most often attributed to neurosyphilis, and it shows), but he has a much worse reputation than I think he really deserves. I’d recommend Genealogy of Morals and The Gay Science; they’re both laid out a bit more clearly than the works he’s most famous for, which tend to be heavily aphoristic and a little scattershot.