Change

This past weekend, a man I consider to be wise and sensible, told me that -

Great change can only come from great conflict.

I'm sure he borrowed this axiom from someone else... it just sounds like a phrase that has been around for a while. But is it true?

Is it possible for a person to wake up one morning and change overnight .... just as a matter of course? On a whim? Do struggle and stress have to be a part of the equation?

And does a great conflict necessarily guarantee some kind of change?