Who said "The preservation of the self is the chief human concern."?

This quote is attributed to Sinclair Lewis.

The preservation of the self is the chief human concern. - Sinclair Lewis

"The preservation of the self is the chief human concern."

Sinclair Lewis Solitude

Novelist American 1885–1951

"It is the nature of progress that it makes the past seem wrong."

"Don't you dare take the lazy approach and accept things as they are."

"Sincere faith is the best intellect, and the best intellect is a faith in the nobility of human nature."

"Every compulsion is put upon us by other people, hardly by ourselves."

"Sometimes being the best means being the loneliest."

"Solitude gives us time to reflect on what matters"

"I'm not good with people, never have been."

"I feel like I'm disappearing."