A man may lack everything but tact and conviction and still be a forcible speaker; but without these nothing will avail. . . . Fluency, grace, logical order, and the like, are merely the decorative surface of oratory.
Source: Human Nature and the Social Order, ch. 9 (1902).
-- Charles Horton Cooley, (Aug 17 1864-1929), US sociologist; He followed a socio-psychological approach to the understanding of society.