words have both a denotative
and a connotative meaning.
The denotative meaning of a
word
is its actual meaning, with no spin on it intended to persuade. The
same word's connotative meaning is what the word suggests after such
a spin has been applied.
For example,
the actual
meaning of the word "propaganda" is "plan for the propagation of
a doctrine or of a system of principles." There's no implication
here that such a doctrine or system is
either good or bad.
But primarily
because of its use by the Nazis, "propaganda" is now given
its connotative meaning by most people, rather than the denotative.
So it now suggests lies, exploitation, concealment of truth, and
other pejorative characteristics or purposes.
Now if you're not aware of this,
you can be grossly mislead by a word.
One of the leading ladies in that
category today is the word "proof." Its denotative meaning is
"evidence that compels acceptance by the mind." Please note that in
this definition, there's still room for doubt in whatever it is that
the evidence is supposed to support.
But that's not the way
people generally react to
the word. To such people, "proof" means certainty, no room for disagreement,
case closed.
And so when
someone tells them that something has been proved, they
tend to accept the statement uncritically and proceed to shut down
their thinking mechanism on the subject involved. From that point
on, it's a piece of cake to manipulate them.
So if you want to avoid being
taken in by others offering you "proof" of something, here's what I
suggest.
Every time you hear the word
"proof," silently ask yourself if you've been persuaded of the
actual validity of what's been "proved."
Because if you haven't, and
you uncritically accept what's been said as gospel, then, in effect,
nothing's
been proved. You've just been conned.
Think about it. 
