It is especially advised not to express your opinion on a subject or issue if what you have got to say is based on hearsay.
Be it on Tibet, or Mao Tse Tsung, or Perak's constitutional crisis, or the Big Bang, or Evolution(which i will never call a theory, because it is a fact), or religion, or even George W. Bush.(The list goes on) It would be much better to be well informed on something before delving into it and forming opinions.
Goethe once said, "He who cannot draw on three thousand years is living from hand to mouth."
When you stare down a manhole, you should not just stand up there and speculate, but go down there and see what's inside.
