Challenge your opinions and assumptions.

From mathematics; if you can find just one example to disprove a theory, the theory has failed. So based on this logic just the above quote provides the contra-diction to accepted wisdom.

I've heard about this previously..hard to say whats in it but interesting none the less. This is a great example of how our opinions can be challenged and forces us to think about what we have taken for granted.

The source of this quote checks out, which only add weight to the claim.