He who would learn to fly one day must first learn to stand and walk and run and climb and dance one cannot fly into flying.

I don't agree with all-male leaderships. Men cannot be left to run things on their own. I think it's a thoroughly bad thing to have a men-only leadership.

History has shown that one cannot legislate a culture of integrity. And yet one of the paramount responsibilities and challenges of corporate leadership is to ensure such a culture.

In fact the converse is true: At a time when the United States has been called on for a level of moral leadership vision and inspiration not seen since World War II we cannot afford to dissemble about crimes against humanity.

You cannot transpose the U.S. system on Turkey and the Turkish system on France etc. You have to understand the people and their culture. That's leadership.

It simply cannot be disputed that for decades the Palestinian leadership was more interested in there not being a Jewish state than in there being a Palestinian state.

Leadership cannot just go along to get along. Leadership must meet the moral challenge of the day.

Leadership cannot really be taught. It can only be learned.

For the things of this world cannot be made known without a knowledge of mathematics.

The tree of knowledge is not the tree of life! And yet can we cast out of our spirits all the good or evil poured into them by so many learned generations? Ignorance cannot be learned.