*
Glenn Gould: I don't know what the effective ratio would be, but I've always had some sort of intuition that for every hour you spend in the company of other human beings, you need "x" number of hours alone. Now, what "x" represents I don't really know; it might be two and seven-eighths or seven and two-eighths, but it is a substantial ratio.
*
Cited in: Solitude, Exile and Ecstasy by Bruce Charlton
http://www.hedweb.com/bgcharlton/solitude.html
*