So these disturbing elements are there, and this is always there. The material nature is like that. Therefore fighting cannot be abolished in the . . . when it is necessary, absolutely necessary. In the Battle of Kurukṣetra, Lord Kṛṣṇa advocated this fighting because it was absolutely necessary.
So anything—it does not matter what it is—when it is sanctioned by Kṛṣṇa, it has no reaction. That is the real work. Other, anything which we do which may be very good work in the estimation of this material world, but that is bound to make you entangled in this material world. This secret one should learn.
karmaṇo hy api boddhavyaṁ boddhavyaṁ ca vikarmaṇaḥ akarmaṇaś ca boddhavyaṁ gahanā karmaṇo gatiḥ (BG 4.17)
Karmaṇo gatiḥ, the path of karma, is very intricate. Therefore one should understand what is actually karma and what is akarma and what is vikarma. And knowing this, one should perform karma. But one thing is that if we simply engage ourself in Kṛṣṇa consciousness, then everything becomes clear. Otherwise, we have to make discrimination, "What I should do, what I should not do, so that I may not be entangled."
Just like in ordinary life we, whatever we do, we sometimes, we may unconsciously doing something which is against the law, and therefore we become bound up by the laws of the state, and sometimes we are in trouble. So similarly, in the laws of nature also, the laws of nature is very strict. There is no excuse. The laws of nature is very stringent. Just like the fire. Fire, it burns. That is natural. This is the law of nature.