1. The emphasis of (keirugma) is on the message. Someone in authority, who has something to communicate, gives the message to a messenger, the (keirux), preacher, who passes the information on to someone else, usually in a public setting. It is expected that there will be attentive hearers who will be receptive to the message and who expect to derive some benefit from the message.
2. The messenger does not proclaim his own viewpoint, his own political opinions, his own grievances. The message is another person's communication. The public proclamation is not the platform for him to expound his own theories, to support his side in a debate, talk about his own projects, or get things off his chest. The (keiru)x does not call the people together for an important proclamation, then, instead, lecture them on some private matter not associated with the real message.
3. The Bible teacher gets his (keirugma) from God Himself, as revealed in the Word of God. Correct preaching is done by making the message clear to the people who are listening to the proclamation. Public teaching protects the privacy of the believer. Confining himself to the message, the preacher does not unduly influence the listeners with personality dynamics or bullying techniques. The listener can accept or reject the message in private.