Because the  Bhagavad-gita  is spoken on the Battlefield of Kuruksetra some people have asked what we have to do with the battlefield. We have nothing to do with any battlefield. We are after knowledge of the spiritual sphere. Then, why should we bother about this battlefield? Because Krsna is on the battlefield, and therefore the whole battlefield has become Krsna-ized. Just as when an electric current is passed into some metal, the whole metal becomes surcharged with electricity; so too, when Krsna is interested in some matter, that matter becomes Krsna-ized. Otherwise, there would be no need of discussing the Battlefield of Kuruksetra. That is His omnipotence.
This omnipotence is also described in  Srimad-Bhagavatam . There are many Krsna  kathas . The Vedic literature is full of them.  Vedas  mean that they are Krsna  kathas . Scripture, including the  Vedas , may appear to be different, but they are all meant for Krsna  katha . If we simply hear these topics on Krsna, then what will be the result? It is pure transcendental vibration, and the result will be spiritual consciousness.
We have accumulated many inauspicious things within our hearts due to our material contamination during the course of many, many births. Many, many births—not only this birth, but past births as well. So, when we search into our hearts with the Krsna  katha , then the contamination we have accumulated will be washed off. Our hearts will be cleansed of all rubbish. And, as soon as all the rubbish is cleared off, then we are situated in pure consciousness.
It is very difficult to eradicate all the false designations from oneself. For example, I am Indian. It is not very easy to immediately think that I am not Indian, but pure soul. Similarly, it is not a very easy task for anyone to end his identification with these bodily designations. But still, if we continue hearing the Krsna  katha , it will be very easy. Make an experiment. Make an experiment to see how easily you'll be able to free yourself from all these designations. Of course, it is not possible to clear out the rubbish from the mind all of a sudden, but we are immediately aware that the influence of the material nature has become slackened.
The material nature is working in three modes—goodness, passion, and ignorance. Ignorance is hopeless life. Passion is materialistic. One who is influenced by the modes of passion wants this false enjoyment of material existence. Because he does not know the truth, he wants to squeeze out the energy of the body just to enjoy this matter. That is called the mode of passion. As for those in the mode of ignorance, they have neither passion nor goodness. They are in the deepest darkness of life. Situated in the mode of goodness, we can understand, at least theoretically, what I