Romans 12:3 (NKJV)
Keeping things in their proper setting is important. There is a normal reading for things like a person's temperature, and a proper setting for how hot or cold some foods should be kept. If your temperature got too high, or too low, it would be an indication of a problem. If some foods are kept at the wrong temperature, they could spoil. But the first thing that is necessary, is to know the proper reading for your temperature and the proper temperature for keeping food. This same principle applies in other areas of life too.
In Romans 12, Paul wrote that it is important for a person to not think more highly of themselves than they ought to think, which means that there is a proper way to think about ourselves which would not be too high, or too low. Thinking wrongly about ourselves is a bad thing to do, and can have negative consequences. We need a proper view of who we are in Christ, as well as seeing other people the way that God sees them, and have the right perspective on everything.
As Paul points out in Romans 12, we should not think too highly of ourselves. And it is also true that we need to be sure we do not think too little, or too low, about ourselves. The only way to do this is by learning what God's standards are for ourselves, others, and everything in life. By knowing what God thinks about things, we can see how we should think. We do not want to think wrongly about anything, including ourselves, and we need a proper, biblical view to have the right view and not think too highly, or too lowly, about ourselves.