Don't you see how many miscreants are suffering? Even you go to the law court, you see how they are suffering. Somebody is putting into jail for so many years, somebody is being ordered to be hanged, somebody is being ordered to be whipped, and so many things are happening. And then you see so many animal life. There are eight million four-hundred-thousands of different species of life. They are suffering.
The tree... If you get the body of a tree, you stand up for ten thousands of years in one place. We have got experience when teacher punishes us, "Stand up on the bench," for a few minutes, we become disturbed: "Sir, please excuse me. I shall not do this." Now, if you have to stand up for ten thousands of years in one place, just see. These are the punishment to the miscreants. So this human body is the only opportunity to understand all these things and make your life successful so that you may not come again for standing up for seven thousand years or ten thousand years. Yes. But the miscreants will not believe this. They think, "A tree, it is another thing. I am perfect." He does not know that every chance there is that you also become a tree.
These are practical examples. You can study. By nature's study you can understand how the miscreants are punished. But unfortunately we have become so dull that even by seeing or by hearing we do not believe them. That's it.
Just like a thief. He sees personally that a man who has committed theft is taken away by the police to the custody, to the prison. He is seeing that, and he has heard the law that "Any man who steals, he will be punished." He has heard it, and he has seen it. Still, he commits theft. Why? He is seeing, and he is hearing. In both ways he is understanding, but still, he is committing theft. That means his heart is not pure.
So the first thing is to make one's heart purified. And this is the process, ceto-darpaṇa-mārjanam, paraṁ vijayate śrī-kṛṣṇa-saṅkīrtanam (CC Antya 20.12), by simply chanting, without paying any price, without any loss on your part. Please try to chant this Hare Kṛṣṇa and see the result. It is so nice movement. (break)
...take it very seriously that "Here is an animal. Here is a tree. They have also got life. They are also living entities as we are. Simply it is different body. That's all." He has got that sort of body; I have got this sort of body. But the demands of the body are there. Even in cats and dog the eating, sleeping, mating and defending... There is four symptoms of life. The cat also, or dog also, eat; we also eat. They also sleep; we also sleep. They have their sex desires; we have got our sex desire. We want to defend from enemies; they also want to defend from enemies. Similarly, in every species of life we will find these four principles existing.