"a man convinced against his will is of the same opinion still"
  [1]http://izquotes.com/quote/360754 appears to be a Samuel
  Butler variation.

  Is it true?
  Good question. I willfully learn and enjoy cognitive dissonance
  that I can handle. Yet in many ways, I'm not so different than I
  was when I was eight years old.

  Did something really change? Assenting to a different choice of
  words while retaining the same framework to me is playing with
  more or less synonymous things or at least replaceable concepts
  structured in the same framework.

  So, I don't know yet.

References

  Visible links
  1. http://izquotes.com/quote/360754