The challenge of preaching is to make sure to proclaim “the whole counsel of God” (Acts 20:27), and still, to regularly (and repeatedly) cover Biblical matters that require regular (and repeated) attention and action by children of God. Sometimes there is a sense of, “You don’t need to hear this again, but I’m going to say it again anyway.” Actually, there is Biblical precedent for this.
Paul wrote, “But concerning brotherly love you have no need that I should write to you, for you yourselves are taught by God to love one another; and indeed you do so toward all the brethren” (1 Thess. 4:9-10). They had already heard it. They were already practicing it. Paul said there was “no need” for him to write to them about it. Yet, in the very next sentence, he said, “But we urge you, brethren, that you increase more and more” (4:10; cf. 3:12).
So, when you’re hearing a sermon or reading an article and think—“I’ve heard this before; I don’t need this”—remember that all Christians need reminders (5:1; cf. 2 Tim. 2:14; Tit. 3:1; 2 Pet. 3:1).