Romans 10:17 (NKJV)
Have you ever been describing something to someone and part way through your description or explanation they stop you and say, "I already know that" or "I've heard that before", letting you know that they are not interested in hearing the rest of what you were going to tell them. You might try to continue and share your information thinking that they don't really know what you are trying to say or you may even realize that they are misunderstanding what you are trying to explain to them. But the other person remains convinced that they really don't need to listen to what you are saying.
Over the years that I have been a Christian, and especially during the years I have been in the ministry, I have had the experience of talking to someone and sharing with them a Bible verse or two that I believe can help them. There have been several times when I have done this that people have responded with, "Yes, I already know that, I've heard that before". But the truth is, if they really knew it or had heard it before and it was something that was a part of their life then their life would be different and I would not be talking to them about it.
No one has heard the truth from God's Word too many times or knows it so well that they don't need to be reminded of it. We must be careful not to develop the "I know that, I've heard that before" attitude. We need to hear the truth from God's Word over and over again, that is how we build our faith and stay strong in our faith. Hearing and hearing the Word of God will help us to stay sharp spiritually and continue moving forward in God's plan for our life.