Acts 20:27 (NKJV)
Whether it is because we have tripped over something and started to fall, inner ear problems, or some other cause, a loss of balance can be a serious problem. Sometimes balance problems can be corrected and sometimes just being careful is a good way maintain proper balance. It would be very foolish to have some kind of balance problem and just ignore it, even when it results in falling down and possibly getting hurt. If there is a problem and there is a solution to the problem then the wise thing to do would be to solve the problem and avoid the negative results.
In the same way that there can be many reasons people might lose their balance physically, there are several reasons that people can lose their balances spiritually. Some believers have problems because they only focus on one spiritual truth and they ignore others, this leads to their being out of balance spiritually. Some Christians do not know some spiritual truths and because of their lack of knowledge they are out of balance spiritually. If we are out of balance spiritually we are in danger of being taken advantage of in the areas where we are unlearned.
In Acts 20, Paul told the leaders from the church in Ephesus that he had not failed to teach them the whole counsel of God. Paul knew that there were many spiritual truths that people needed to hear and he taught them all. Paul may have emphasized one topic at one time more than another, but Paul knew people needed to hear many topics to have a well-balanced spiritual life. If we are overemphasizing one spiritual truth at the expense of other truths, or lacking biblical knowledge in some areas, we can easily get out of balance spiritually. We all need the whole counsel of God, the whole Word of God, to lead a balanced, mature Christian life.