Diverse Quotations from a Novel I'm Reading

I'm reading a novel with quotations at the beginning of each chapter. Some seemed worth sharing.

"Friendship is a very taxing and arduous form of leisure activity." -Mortimer Adler

"A woman is like a tea bag--you can't tell how strong she is until you put her in hot water." - Nancy Reagan

"The best way to know a man is to watch him when he is angry." -Hebrew Proverb

"It is one thing to show a man that he is in error, and another to put him in possession of truth." - John Locke