Source, in full
Attributed in A Dictionary of Thoughts (1908) by Tryon Edwards; this is earlier attributed to Theodore Roosevelt in Life of William McKinley (1901) by Samuel Fallows, and could be derived from the remarks of Ulysses S. Grant in his First Inaugural Address (4 March 1869): "I know no method to secure the repeal of bad or obnoxious laws so effective as their stringent execution".