Need a translation into Latin of the phrase "Harder, faster, don't
stop".  These words should fit the context of "You must try harder,
you must run faster, you must not stop."  Singular "you" in all cases.
 Thanks!

Hello.

Assuming that you want it to be the slogan for a team or group of
people, I'd go with:

"Fortius. Citius. Nolite sistere." 


If it were intended as a slogan for an individual:

"Fortius. Citius. Noli sistere."

references:

" The motto of AVIS ["We try harder"] in Latin is Fortius conamur."
source: Latin: PART I: REVIEW OF BASIC VOCABULARY
http://www.class.uidaho.edu/luschnig/Latin%20Vocab/1.htm

"citius (comparative adverb of cito, quickly) more quickly, faster"
http://www.class.uidaho.edu/luschnig/Latin%20Survey/desen1-2.htm

"sisto, sistere  =  to stop, to put an end to"

http://www.wise.k12.va.us/dlp/LatinIA/november%20notes.htm

"Noli sistere!  One way of saying 'Don't stop!' in Latin...
It's important to know that there's a singular-plural distinction even
in the imperative. If she had been commanding more than one person to
not stop, she would want to say Nolite sistere!"
source: plexoft.com
http://www.plexoft.com/SBF/N04.html

More on the negative imperative form:

"Negative imperatives. The easiest way to form the negative imperative
is to use the imperative of the verb nolo plus the infinitive:
Noli dormire! Don't sleep
Nolite dormire! Don't sleep (you guys)"
source: U. of Oklahoma: Latin Online
http://www.mythfolklore.net/medieval_latin/grammar/imperative.htm

----------
strategy:
my own knowledge of latin, plus various searches:
citius, faster
"try harder" latin fortius
"don't stop in latin"
noli nolite don't
sisto sistere stop

Thanks!

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Clarification of Answer by juggler-ga on 27 May 2004 19:54 PDT

I should have also mentioned that your slogan is quite similar to the
Olympic motto, "Citius! Altius! Fortius!"  Higher! Faster! Harder!
(also translated as Stronger! sometimes).
http://www.marchebonsecours.qc.ca/ex_expo/ath/eng/ath_cpea.htm

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Clarification of Answer by juggler-ga on 27 May 2004 19:57 PDT

I just notice that the Olympic page immediately above put the words out of order.
 
It should have been:
"Citius! Altius! Fortius! Faster! Higher! Harder!"

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Request for Answer Clarification by cobralassie-ga on 27 May 2004 21:11 PDT

Great!  One question - does it make a difference if the word "harder"
is used to mean "with great force" (as in throwing) as well as "with
great effort"?

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Clarification of Answer by juggler-ga on 27 May 2004 21:35 PDT

Thank you for the tip.

"Fortius" is often translated as "stronger" (or using greater force). 
It is also translated as "harder" in the sense that you initially
mentioned (i.e., "you must try harder" or use more effort).  It seems
to be best word to us in that sense.

Another example of that:
"American evangelistic slogan  fortius conamur = If we try harder"
http://www.holyfamilyvb.org/TQnotes/20020616.shtml

I hope that helps.

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Clarification of Answer by juggler-ga on 27 May 2004 21:36 PDT

I apologize for that typo:

"... best word to USE in that sense."

Clear, useful, and quick answer.  Everything I need.  Thank you.