To achieve peace of mind is the goal of all mankind. Now, given that, what anxiety could you possibly feel towards serving me? Any other peace of mind would come easily if you do. Doesn't challenging me, even knowing that it may spell your death, bring you anxiety? You are a very capable Stand user. It's a waste to kill you. Why not cut ties with Joestar and the others, and serve me for eternity? I can promise you peace of mind for eternity.