Discussion is an exchange of knowledge; an argument an exchange of ignorance.

Discussion is an exchange of knowledge; argument is an exchange of ignorance

Behind every argument is someone's ignorance.

There is no slavery but ignorance.

Fullness of knowledge always means some understanding of the depths of our ignorance; and than is always conducive to humility and reverence.

Don't raise your voice, improve your argument."

[Address at the Nelson Mandela Foundation in Houghton, Johannesburg, South Africa, 23 November 2004]