
“I live in that solitude which is painful in youth, but delicious in the years of maturity.”
"Self-Portrait" (1936), p. 5 http://books.google.com/books?id=Q1UxYzuI2oQC&lpg=PP1&pg=PA5#v=onepage&q&f=false
1950s, Out of My Later Years (1950)
Variant: I live in that solitude which is painful in youth, but delicious in the years of maturity.