In our industrial and social system the interests of all men are so closely intertwined that in the immense majority of cases a straight-dealing man who by his efficiency, by his ingenuity and industry, benefits himself must also benefit others.
 Theodore Roosevelt, State of the Union Address. copy citation

Context

“In the long run the one vital factor in the permanent prosperity of the country is the high individual character of the average American worker, the average American citizen, no matter whether his work be mental or manual, whether he be farmer or wage-worker, business man or professional man. In our industrial and social system the interests of all men are so closely intertwined that in the immense majority of cases a straight-dealing man who by his efficiency, by his ingenuity and industry, benefits himself must also benefit others. Normally the man of great productive capacity who becomes rich by guiding the labor of many other men does so by enabling them to produce more than they could produce without his guidance; and both he and they share in the benefit, which comes also to the public at large.” source