A novice was trying to fix a broken Lisp machine by turning the power
off and on.  Knight, seeing what the student was doing spoke sternly:
"You can not fix a machine by just power-cycling it with no
understanding of what is going wrong."  Knight turned the machine off
and on.  The machine worked.

The assertion that "all men are created equal" was of no practical use
in effecting our separation from Great Britain and it was placed in the
Declaration not for that, but for future use.
		--  Abraham Lincoln