a quote i chanced upon while reading football stuff.

Good sense is the most evenly shared thing in the world, for each of us thinks he is so well endowed with it that even those who are hardest to please in all other respects are not in the habit of asking for more than what they have. It is unlikely that everyone is mistaken in this.

It indicates rather that the capacity to judge correctly and the ability to distinguish the true from false, which is properly what one calls common sense or reason, is naturally equal in all men, and consequently the diversity in our opinion does not spring from some of us being able to reason more than others, but only from our conducting our thoughts along different lines and not examining the same things.

-- Rene Descartes.