Wisdom can only be learned gradually, and every soul is not ready to receive or to understand the complexity of the purpose of life.
Man likes complexity. He does not want to take only one step; it is more interesting to look forward to millions of steps. The man who is seeking the truth gets into a maze, and that maze interests him. He wants to go through it a thousand times more. It is just like children. Their whole interest is in running about; they do not want to see the door and go in until they are very tired. So it is with adults. They all say that they are seeking truth, but they like the maze. That is why the mystics made the greatest truths a mystery, to be given only to the few who were ready for them, letting the others play because it was the time for them to play.