This was quoted in the first Lenten sermon I preached at the Cathedral Church of the Advent the audio for which was posted Monday, and I have had requests for the citation–KSH.
Courage…is the indispensable requisite of any true ministry…. If you are afraid of men and a slave to their opinion, go and do something else. Go make shoes to fit them. Go even and paint pictures you know are bad but will suit their bad taste. But do not keep on all of your life preaching sermons which shall not say what God sent you to declare, but what they hire you to say. Be courageous. Be independent.
—-Phillips Brooks, Lectures on Preaching, the 1877 Yale Lectures (Grand Rapids: Baker, 1969), p. 59