Change is not merely necessary to life - it is life.

We need a multiplicity of visions, dreams and prophecies - images of potential tomorrows.

The recognition that no knowledge can be complete, no metaphor entire, is itself humanizing. It counteracts fanaticism. It grants even to adversaries the possibility of partial truth, and to oneself the possibility of error.

The illiterate of the future will not be the person who cannot read. It will be the person who does not know how to learn.

Never in history has distance meant less.

Knowledge is promiscuous. It mates and gives birth to more knowledge.

Knowledge is the most democratic source of power.