"The things that will destroy America are
prosperity-at-any-price, peace-at-any-price,
safety-first instead of duty-first,
the love of soft living,
and the get-rich-quick theory of life."
-- Theodore Roosevelt
(1858-1919) 26th US President
Source: letter 01/10/1917 
http://quotes.liberty-tree.ca/quote_blog/Theodore.Roosevelt.Quote.70C8

"I wish to preach not the doctrine of ignoble ease 
but the doctrine of the strenuous life." -- Theodore Roosevelt/dt

"Foolish fanatics ... the men who form the lunatic fringe in all 
reform movements." -- Popularized in his autobiography, not coined.