It is a common error for parents to think that if they discipline their children, they will not like them later in life. This is especially the case when at the time of the discipline the child makes a comment to the effect that they hate you. Another winner at this juncture is when a child announces in overdramtic fashion that you are ruining their life. Let me assure you from having reared 6 children of all personality types - when you discipline them you are not ruining their lives. What you are doing is insuring that at a later date you will find comfort and delight in a child who knows how to control himself and make wise choices.
Correcting your son involves discipline. The word here is "yasar" and it means to discipline, chasten, instruct, teach, and even punish. This process of correction therefore takes into account all the aspects of rearing a child. It means so much more than just spanking or punishing a child when they do wrong. It involves instructing and teaching them even as you chasten and punish them. It is not enough to tell a child something is bad - you have to eventually explain why something is bad or a wrong choice. When you do this, you take the time to encourage them toward godly, right behavior.
When you rear a child in this fashion you will find that your son gives you two wonderful things. First, we are told that he gives us "comfort." The word here means to give someone a sense of rest and repose. It can also mean a rest in the way you feel when you are satisfied with something. A well-disciplined child, although a chore during the process, will give a parent rest as they make godly, wise choices later in life. I know from a little experience and from helping others that when a child makes unwise choices - it can rob you of any sense of rest or relaxation. Some parents seem to spend a majority of their latter years rescueing a child from one disaster after another. That is not rest!
The second blessing that comes to parents who correct their children is delight. The Hebrew word here is "ma'aden" and it means something of beauty or when refering to food something that tastes wonderful. One of the blessings that I have is that of thoroughly enjoying my children. We have 6 of them - and they are a delight to the soul of their mother and father. When they visit we speak deeply of spiritual things - and we have a blast together - often laughing and enjoying each other's company. That is what is promised here.
Now just a word in closing on this proverb. The delight often comes later in life - because rearing a child is a full contact sport! There were many times when we struggled to know what to do - and how to deal with rebellion in our children. There were times when my wife and I were dropped to our knees in broken-hearted prayer on their behalf. We both know that the reason they are godly today is because of God's grace and mercy - not our wonderful, bookworthy parenting. So do not lose heart if at first you read this and wonder about such words as comfort and delight. That comes after you've spent 15-20 years of work together rearing them - praying for them - and often wondering what may become of them. That part is the "correcting" phase. It is not always delightful - but is very useful to God not only to bless your children - but to drop you to your knees for a few times of God's work in you as well.