Since we are not yet fully comfortable with the idea that people from the next village are as human as ourselves, it is presumptuous in the extreme to suppose we could ever look at sociable, tool-making creatures who are from other evolutionary paths and see not beasts, but brothers, not rivals, but fellow pilgrims journeying to the shrine of intelligence...The difference... is not in the creature judged, but in the creature judging.
DemosthenesThere are all kinds of devices invented for the protection and preservation of countries: defensive barriers, forts, trenches, and the like... But prudent minds have as a natural gift one safeguard which is the common possession of all, and this applies especially to the dealings of democracies. What is this safeguard? Skepticism. This you must preserve. This you must retain. If you can keep this, you need fear no harm.
Demosthenes