In the days after the U.S. Supreme Court outlawed segregated buses in 1956, Dr. Martin Luther King wrote to the members of the Montgomery Improvement Association with some instructions on how to ride the newly desegregated buses.
Remember, the Montgomery bus boycott had been going on for a year! The decision was a huge victory. But King wrote the riders should....
"demonstrate the calm dignity of our Montgomery people in your actions... be quiet but friendly. Proud but not arrogant...joyous but not boisterous..."
Here's a version that you may find easier to read.