In what we really understand, we reason but little.

Perfect understanding will sometimes almost extinguish pleasure.

It is less dishonour to hear imperfectly than to speak imperfectly. The ears are excused: the understanding is not.

You can be totally rational with a machine. But if you work with people, sometimes logic often has to take a backseat to understanding.

All the glory of greatness has no lustre for people who are in search of understanding.

Quality... you know what it is, yet you don't know what it is.

Time which diminishes all things increases understanding for the aging.

How the hell do I know why there were Nazis? I don't know how the can-opener works.

I do not want the peace which passeth understanding. I want the understanding which bringeth peace.

A student who parked her car on the University of Toronto campus found this note on it from the Great Communicator, Marshall McLuhan: 'You are parking in my spot. Please find another for yourself elsewhere.' The following day she replied to this note: 'Dear Professor, as you will realize, I moved. I am most grateful to you. Your note is the first of your writings I have fully understood.'