The old appeals to racial, sexual and religious chauvinism to rabid nationalist fervor, are beginning not to work.

You have to know the past to understand the present.

We are like butterflies who flutter for a day and think it is forever.

For all our failings, despite our limitations and fallibilities, we humans are capable of greatness.

We began as wanderers, and we are wanderers still.

Observation: I can't see a thing. Conclusion: Dinosaurs.

Our perceptions are fallible. We sometimes see what isn't there. We are prey to optical illusions. Occasionally we hallucinate. We are error-prone.