“The boldness of his mind was sheathed in a scabbard of politeness.”
Source: Jefferson the Virginian
Dumas Malone was an American historian, biographer, and editor noted for his six-volume biography on Thomas Jefferson, Jefferson and His Time, for which he received the 1975 Pulitzer Prize for history. In 1983 he was awarded the Presidential Medal of Freedom. Wikipedia
“The boldness of his mind was sheathed in a scabbard of politeness.”
Source: Jefferson the Virginian