Darwin's theory of evolution, that is not perfectly explained. It is explained in the Vedic literature. So just a tree is standing for ten thousands of years, we had to pass through this life. But there is no perfect knowledge. We are thinking that we are now very nice American body or Indian body. No. It took so many years to come to this life. Therefore śāstra says, labdhvā sudurlābhaṁ idaṁ bahu-sambhavānte (SB 11.9.29): "You have got this human form of life after many, many millions of years' waiting." So do not misuse it. That is Vedic civilization, not to misuse the human form of life.
Nature's law is very, very strict. This life it is given, a chance. Nature gives a chance. Now you get this human form of life, advanced consciousness. Now you make further improvement. That is wanted. From here we can make further improvement. What is that further improvement? We can go to the better planets. There are many better planets. You can go there, heavenly planets. There you can live for ten thousands of years. Ten thousands of years, and that is also not our year. The higher planetary system, their one day—our six months. In that way you can live there for ten thousands of years. And the standard of living condition is thousand times better. Therefore it is called heavenly.
So if you like, you can go there. Ūrdhvaṁ gacchanti sattva-sthaḥ (BG 14.18). Yānti deva-vrataḥ devān (BG 9.25). Everything is explained. Or if you can go, if you like you can go to the Pitṛloka. If you want to remain here as human being, you can also remain here, but you have to work for it to keep your position, status. Just like if you become rich man, high standard of life, you have to maintain it. Not that it will continue automatically. No, that is not possible, sir. This material world is not like that: you get one position and it will continue. No. A little discrepancy, immediately deteriorate your position. So you have to maintain it.