The rules of the universe that we think we know are buried deep in our processes of perception.

The major problems in the world are the result of the difference between how nature works and the way people think.

It is to the Riddle of the Sphinx that I have devoted fifty years of professional life as an anthropologist.

Some tools of thought are so blunt that they are almost useless; others are so sharp that they are dangerous. But the wise man will have the use of both kinds.

There are many matters and many circumstances in which consciousness is undesirable and silence is golden, so that secrecy can be used as a marker to tell us that we are approaching the holy.

No organism can afford to be conscious of matters with which it could deal at unconscious levels.

Those who lack all idea that it is possible to be wrong can learn nothing except know-how.