You can adjust yourself in the spiritual nature, but you cannot adjust yourself in the material nature. Therefore material nature, however you can make your plans for becoming happy, it will be frustrated. Because you do not . . . you cannot adjust yourself with this material nature.
Just like this body. This body is a product of this material nature. Now, however you can take care of this body, however you may go on making this body very strong and stout, still, you cannot maintain it. It will be finished today or tomorrow or a hundred years after. You cannot protect it. This is material nature. But I have got the tendency to keep my body fit, strong and eternal. That is my tendency. People are taking so much exercise just to become very strong and stout. But nature will not allow you. However stout and strong you may be, you have to die. You have to give up this body.
This body is temporary, but our tendency is to live forever. The scientists are trying how to keep this body fit. One Russian scientist said that, "By material science we shall be able to keep this body forever." They may say like that, but in the history we do not find any evidence that anyone has ever been able to keep this body forever, immortal. That is not possible.