From Star Trek: The Next Generation (#119 "The First Duty") - Picard to W.Crusher
The first duty of every Starfleet officer is to the truth, whether it's scientific truth or historical truth or personal truth! It is the guiding principle on which Starfleet is based! If you can't find it within yourself to stand up and tell the truth about what happened, you don't deserve to wear that uniform!
The annotated version of the puzzle:
 the |
 first |
 duty |
 of |
 every |
 starfleet |
 officer |
 is |
 to |
the |
 truth |
 whether |
 it's |
 scientific |
truth |
 or |
 historical |
truth |
or |
 personal |
truth |
 it |
is |
the |
 guiding |
 principle |
 on |
 which |
starfleet |
is |
 based |
 if |
 you |
 can't |
 find |
it |
 within |
 yourself |
to |
 stand |
 up |
 and |
 tell |
the |
truth |
 about |
 what |
 happened |
you |
 don't |
 deserve |
to |
 wear |
 that |
 uniform |