St. Augustine:

When a certain rhetorician was asked what was the chief rule in eloquence, he replied, ‘Delivery’; what was the second rule, ‘Delivery’; what was the third rule, ‘Delivery.’

So if you ask me concerning the precepts of the Christian religion, first, second, third, and always I would answer, ‘Humility.’

(Quoted in Bavinck, Herman. Prolegomena. Ed. John Bolt. Trans. John Vriend. Vol. 1. (Grand Rapids, MI: Baker Academic, 2003), 441.)