"Everyone is superior to him in one way or another".
Let's not be like WT, and take things out of context. This is a true statement and something that is healthy for young people to learn. While you may be born with good looks, inherit an ability, or honed a skill that comes naturally to you, it doesn't make you better than others. Everyone has something they are better than you at.
Now where I differ is that whatever skill, or trait a child works on, and excels at, should be applauded and encouraged. You should make your child feel special for those qualities, while occasionally instilling in them that they should recognize and appreciate special qualities of others, and recognize that others are superior to him, in one way or another. I also think that instilling the point that we are all human, and that if something is achievable for one person, it is attainable by another. Aside from good looks, most "talent" isn't a gift, it's only through hard work and perseverance that a person acquires skill and mastery.