In the New Testament there are no less than five words sometimes translated “preach.” One of these, found in Mark 2:2, is commonly rendered “speak, talk, or tell.” Another found in Luke 9:60 is elsewhere rendered “declare or signify.” Another in Acts 4:2 is rendered “show, speak, teach, or declare.” Another in Luke 3:18 means to declare, to preach, to bring good tidings, show glad tidings, and declare glad tidings. It can also mean “publish or proclaim.” The nouns always mean preacher and preaching. It occurs more than fifty times in the New Testament and is found in each of the Gospels, in Acts, in ten of Paul’s epistles, in 1 Peter, and in Revelation; it primarily means “heralding.” A messenger might be sent to one man or one family, but a herald was to make loud and indiscriminate proclamation of the business on which he was sent. The former might have a secret to tell to one or a few. But the other one, a herald, was a public crier. His instruction were given him. To those instructions he was confined and he could not vary.
– William S. Plumer
John Wesley once wrote to a minister: “Your ability in preaching does not increase; it is about the same as it was seven years ago; it is lively, but not deep; there is little variety or compass of thought. Reading alone can supply this, with daily meditation and daily prayer. You wrong yourself greatly by omitting this. You can never be a deep preacher without it, any more than a thorough Christian. Oh, begin! Fix some part of every day for private exercises. You may acquire the taste which you do not have. What is tedious at first will afterward be pleasant. Whether you like it or not, read and pray daily. It is for your life; there is no other way. Otherwise, you will be a trifler all your days and a petty, superficial preacher. Do justice to your own soul; give it time and means to grow, and do not starve yourself any longer.”