when men and women cease to regard a worthy family life, with all its duties fully performed, and all its responsibilities lived up to, as the life best worth living
 Theodore Roosevelt, State of the Union Address. copy citation

Context

“It is neither safe nor proper to leave the question of polygamy to be dealt with by the several States. Power to deal with it should be conferred on the National Government. When home ties are loosened; when men and women cease to regard a worthy family life, with all its duties fully performed, and all its responsibilities lived up to, as the life best worth living; then evil days for the commonwealth are at hand. There are regions in our land, and classes of our population, where the birth rate has sunk below the death rate. Surely it should need no demonstration to show that wilful sterility is, from the standpoint of the nation, from the standpoint of the human race, the one sin for which the penalty is national death, race death;” source