In order to shake a hypothesis,
it is sometimes not necessary
to do anything more than
push it as far as it will go.
You cannot run a business, or
anything else, on a theory.
?Harold S. Geneen
In theory there is no difference between
theory and practice. In practice there is.
Life is so unlike theory.
A theory has only the alternative of
being right or wrong. A model has a
third possibility - it
may be right but irrelevant.
Let us work without theorizing,
'Tis the only way to make life endurable.