The men who are idle or credulous, the men who seek gains not by genuine work with head or hand but by gambling in any form, are always a source of menace not only to themselves but to others.
 Theodore Roosevelt, State of the Union Address. copy citation

Context

“If the hand of the Lord is heavy upon any country, if flood or drought comes, human wisdom is powerless to avert the calamity. Moreover, no law can guard us against the consequences of our own folly. The men who are idle or credulous, the men who seek gains not by genuine work with head or hand but by gambling in any form, are always a source of menace not only to themselves but to others. If the business world loses its head, it loses what legislation cannot supply. Fundamentally the welfare of each citizen, and therefore the welfare of the aggregate of citizens which makes the nation, must rest upon individual thrift and energy, resolution, and intelligence.” source