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Action in Knowledge of Kṛṣṇa
na māṁ karmāṇi limpanti 
    na me karma-phale spṛhā 
    iti māṁ yo'bhijānāti 
    karmabhir na sa badhyate
“There is no work that affects Me; nor do I aspire for the fruits of action. One who understands this truth about Me also does not become entangled in the fruitive reactions of work.”(Bg.4.14)
The whole world is bound by  karma . We all know of the existence of microbes or germs which exist by the million within the measurement of one millimeter. In the  Brahma-saṁhitā  it is stated that beginning with the microbe, which is called  indra-gopa , up to Indra, the king of the heavenly planets, all are bound by  karma , the reaction of work. We all have to suffer or enjoy the reactions of our work, be they good or bad. As long as we have to suffer or enjoy these reactions, we are bound to these material bodies.
By nature’s arrangement the material body is given to the living entity for his suffering or enjoying. Different types of bodies are acquired for different purposes. The body of a tiger is made for killing and eating raw meat. Similarly, the hogs are made in such a way that they can eat stool. And as human beings our teeth are made for eating vegetables and fruits.
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