"Throughout the nineteenth century you can find writers using brothers and sisters as ways of projecting different aspects of the single composite self. The most famous example is the Brothers Karamazov, who, with their differing emphases on body, mind and spirit, seem to be the three parts of one total individual – the collective son of their father, perhaps Man himself."
January 1, 1970
https://en.wikiquote.org/wiki/Fyodor_Dostoyevsky