One of the e-newsletters I subscribe to is John Maxwells Leadership Wired. Here are the quotes on 'Poise' from the latest.
"The more tranquil a man becomes, the greater is his success, his influence, his power for good. Calmness of mind is one of the beautiful jewels of wisdom." ~ James Allen
"Whenever you get into a jam, whenever you get into a crisis or an emergency, become the calmest person in the room and you'll be able to figure your way out of it." ~ Rudolph Giuliani
"Calmness is the cradle of power." ~ Josiah Gilbert Holland
"Nothing gives a person so much advantage over another as to remain always cool and unruffled under all circumstances." ~ Thomas Jefferson