Just started reading Saul Bellow Letters edited by Benjamin Taylor.  I am hoping for a fascinating insight to this 20th century writer.  To start with (!):

“That I’ve become an unforthcoming correspondent is perfectly true; I take no pleasure in these silences of mine; rather, I’m trying to discover the reasons why I so seldom reply.  It may be that I’m always out with a butterfly net trying to capture my mature and perfected form, which is just about to settle (once and for all) on a flower.  It never does settle, it hasn’t yet found its flower.  That may be the full explanation.”
pp viii West Brattleboro, Vermont Summer 1983