Exercise for the student -- find the contradiction here:

You consider 'sufficiently powerful' and "doesn't offer easy ways of extending the syntax" to be contradictory. Does that mean you consider only Lisps 'sufficiently powerful'?

  Insufficient knowledge is probably why you mistook the
  sense of the statement you are replying to by 180 degrees.

Do you mean extending the syntax of Python or Java is easy? Otherwise I'm not sure what the knowledge is you think I'm lacking.