herman hesse, esp. reread narcissus and goldmund. then maybe journey to the east, & the glass bead game.
read as many as possible nobel prize winners in literature.
e.g. sartre, steinbeck, camus, agnon, samuel beckett, pablo neruda,octavio paz, derek walcott, seamus heaney, etc.
and for autobiographies: nelson mandela, mother T, & ruben hurricane carter. & janusz korczak.