Tact is the unsaid part of what you think.
Source: In Webster's Electronic Quotebase, ed. Keith Mohler, 1994.
-- Henry Vandyke, (Nov 10 1852-1933), US poet, clergy, educator; He was a popular poet in the early 1900s with The White Bees, and Other Poems, 1909 and Chosen Poems, 1927.