Passionate expression and vehement assertion are no arguments, unless it be of the weakness of the cause that is defended by them, or of the man that defends it.

William Chillingworth (1602-1644) English churchman and theologian

(Attributed)
    (Source)

Quoted in The Parliamentary History of England, Vol. 15, 29 George II, "Debate on a Motion for a Vote of Censor on the Treaties with Russia and Hesse Cassel (1755)" (1813)