Steve Lawson gives ten characteristics of Calvin’s preaching that we expositors would do well to emulate. You can read more about this in his book John Calvin: A Heart for Devotion, Doctrine, and Doxology .
“Let those who would discharge aright the ministry of the gospel learn, not merely to speak and declaim, but to penetrate into the consciences of men, to make them see Christ crucified, and feel the shedding of his blood. When the Church has painters such as these, she no longer needs the dead images of wood and stone, she no longer requires pictures; both of which, unquestionably, were first admitted to Christian temples when the pastors had become dumb and been converted into mere idols, or when they uttered a few words from the pulpit in such a cold and careless manner, that the power and efficacy of the ministry were utterly extinguished.”
–John Calvin, Commentary on Galatians, p. 81.