The late Vernon Howard was quite a character. If you do a search for him on the net you'll find an interesting story.

This is one of his lessons:

"GROCERIES

'I would like to attend your class.'

'We meet Saturday at ten in the morning.'

'I usually shop for groceries on Saturday morning, but maybe
I can make it.'

'You won't make it.'

"How do you know?'

'You have just told me what you really value.'"

There is a Way Out, p. 71