Material world means everyone is working hard only for the happiness of the body. And some of them, they are trying to be happy by the happiness of the mind. Just like arts, poetry, philosophy, speculating on. But both of these kinds of happiness will not give us real happiness. Because real happiness belongs to the soul. Basic principle of happiness missing. Therefore simply by bodily comforts, sense gratification, we cannot be happy. And actually it is so happening. People are endeavoring throughout the whole world for bodily comforts, for sense gratification, but they're not happy. There cannot be happiness. Because... The same example. Suppose you have got a nice coat. If you simply show the coat and iron the coat and keep it very nice, that does not mean you'll be happy. Because you are trying to get happiness from the coat or shirt. That is not happiness, that is not possible. Happiness is possible when you try to make happy the soul. Then happiness is possible. Another example is given—just like a bird within the cage. If you simply wash the cage and keep it very nice and don't give any food to the bird, then the bird will never be happy simply by polishing the cage. So this is the cage, this material body is the cage of the soul. Therefore material living being is called conditioned or encaged. That is the beginning of Bhagavad-gītā.
- dehino 'smin yathā dehe
- kaumāraṁ yauvanaṁ jarā
- tathā dehāntara-prāptir
- dhīras tatra na muhyati
- (BG 2.13)
This is the beginning of spiritual knowledge. One must understand that the soul is encaged within this body and mind. So if you try to become, by bodily comforts or mental satisfaction, it will never be possible. Happiness will never be possible.