If you're unwilling to earnestly, critically examine/scrutinize your beliefs, and discard them in failing that scrutiny or in light of new information, you are doomed to stagnate as a individual.
An important sentiment in these times of belligerent, entrenched ideologies imho.
I loved his regeneration speech about how to be.
Always try to be nice, but never fail to be kind!
Never eat pears!