In this book we will start with the main points that the teacher of this book addressed to his reader, these points are mysterious, the injustice and the frustrations of life. And in all these circumstances of life, we see that God is the ruler and controller of our destiny. The first thing the book addresses to its reader is how one can enjoy life through the gift of hard work that God has given to the sons of men under the sun. in this book, life is understood as pointless due to its complications. No matter how someone spends their whole life working and working hard, the question is: what do they have to show for it? Life is like a wrapper after the wind as generations come and go, but life goes on. Therefore, no satisfaction, even the ears do not hear enough. Besides this, under the sun, there is nothing new and there is no difference between the wise and the fool because both have the same destiny (death). This book teaches that the wiser you are, the more you worry; the more you understand, the more it is...