Some people get lost in thought because it's such unfamiliar territory.
G. Behn
Never be afraid to sit awhile and think.
Lorraine Hansberry, A Raisin in the Sun
Few minds wear out; more rust out.
Christian N. Bovee
Men can live without air a few minutes, without water for about two weeks, without food for about two months - and without a new thought for years on end.
Kent Ruth