Each man has a different nature so we don't differ only in out shape, but inside as well. As everyone have his interests and special ambitions. The difference doesn't mean collision, but means that we complete each other and because the final total to each person is 100%, the interests and aims- which we want to achieve- are different each one has an aim which he saw that brings happiness… But what's the real happiness? …. What is the way to get it? Will we get the happiness if we achieve our life aims? What is the measurement we will use to measure? So the wise advises us the following wisdom and make us have a look at an important thing may be we forgot in our busy life which took us away from the main aim: "You should make yourself a statue to keep you in the eternity world, don't make it of gold because the robber's rob it. Don't make it of stone because the natural storms will affection, don't make it of wood because envious' fires will burn it… but make it of your kind works which never die and keep you and your statue in the eternity world".
The wise saw the thing which eternizes man is what he left of kind effect on people whom treated. That happens through your kind works and these works will do another work with you. They don't leave you in the eternity world.
Someone may ask: Did the wise forget to mention something? Was not wisdom completed? The answer will be: "Yes", the wisdom didn't say what are the kind works?.... but it depends on each one to choose himself the types of his kind works which he can do, these works are known by the God. Beneficent is known and Evil is known and each one will do as he could, so the difference between us is an advantage from the God and what would happen if all of us do the same things.