The more complex civilization becomes, the more difficult will become the art of living. The more rapid the changes in social usage, the more complicated will become the task of character development. Every ten generations mankind must learn anew the art of living if progress is to continue. And if man becomes so ingenious that he more rapidly adds to the complexities of society, the art of living will need to be remastered in less time, perhaps every single generation. If the evolution of the art of living fails to keep pace with the technique of existence, humanity will quickly revert to the simple urge of living-the attainment of the satisfaction of present desires. Thus will humanity remain immature; society will fail in growing up to full maturity.