“For me, politeness is a sine qua non of civilization.”
Other Robert A. Heinlein Quotes
For me, politeness is a sine qua non of civilization.
Robert A. Heinlein 
62% of people like this quote
Be wary of strong drink. It can make you shoot at tax collectors... and miss.
Robert A. Heinlein
56% of people like this quote
Anyone who considers protocol unimportant has never dealt with a cat.
Robert A. Heinlein
56% of people like this quote
No statement should be believed because it is made by an authority.
Robert A. Heinlein
56% of people like this quote