If you don't choose the right time to speak, then whatever you say will mean nothing.Before sowing, the land should be plowed, and the seeds of merit are not easy to grow. Before they can take root and germinate, they must be prepared for a long time.The reason why preaching is impossible to be effective is because the content of the preaching to whomever is the same, there is no difference, and there is no choice.How can people think that the same preaching can be suitable for so many listeners?They have different temperaments and are not alike mentally, with different tempers, ages, sexes, states and views.Perhaps, in the midst of so many, you will not find two really suitable hearers for your sermons.