On the wise principle of letting well alone, he perceived that the happy time had arrived for leaving the room.
"Heart and Science" by Wilkie Collins
The letting-alone principle is a short-sighted one.
"The Secret of a Happy Home (1896)" by Marion Harland
But the principle of "let alone" has obstinate enemies.
"Sophisms of the Protectionists" by Frederic Bastiat
As for the farm, it had flourished, on the "let alone" principle.
"The Chainbearer" by J. Fenimore Cooper
No guiding principle was found to limit the number of vacua, let alone to reduce the result to a unique vacuum which would contain in it all information currently available, including all mass hierarchies, all coupling constants, and so on.
Reflections and Impressionistic Portrait at the Conference "Frontiers Beyond the Standard Model," FTPI, Oct. 2012