Each day as I travel through downtown Tucson I am amazed at how quickly the most ancient of human behaviors have changed. For as long as there have been Homo sapiens - roughly 200 000 years - people have filled their lives principally with two activities: talking directly with other people and doing physical things.

My grandmother was a teacher my sister was a teacher my daughter was a teacher and is now a superintendent in northern California and my son-in-law is a high school principal. I am surrounded.

To smile at the jest which plants a thorn in another's breast is to become a principal in the mischief.

Change is the principal feature of our age and literature should explore how people deal with it. The best science fiction does that head-on.

We will work with industrial or Dept. Of Defence sponsorship as long as we keep our principals of openness firm we're proud to work with the military and they respect that in turn.

I say quite deliberately that the Christian religion as organized in its Churches has been and still is the principal enemy of moral progress in the world.

The American polity is infected with a serious imbalance of power between elites and masses a power which is the principal threat to our democracy.

I had many teachers that were great positive role models and taught me to be a good person and stand up and be a good man. A lot of the principals they taught me still affect how I act sometimes and it's 30 years later.

Patriotism must be founded on great principals and supported by great virtue.

Is there some principal of nature which states that we never know the quality of what we have until it is gone?