Here is another thing to learn. How do you know that nature is finite? You can only know this through metaphysics. Nature is that Infinite under limitations. Therefore it is finite. So, there must come a time when we shall have conquered all environments. And how are we to conquer them? We cannot possibly conquer all the objective environments. We cannot. The little fish wants to fly from its enemies in the water. How does it do so? By evolving wings and becoming a bird. The fish did not change the water or the air; the change was in itself. Change is always subjective. All through evolution you find that the conquest of nature comes by change in the subject. Apply this to religion and morality, and you will find that the conquest of evil comes by the change in the subjective alone. That is how the Advaita system gets its whole force, on the subjective side of man. To talk of evil and misery is nonsense, because they do not exist outside. If I am immune against all anger, I never feel angry. If I am proof against all hatred, I never feel hatred.