When God created man , he gave man the a perfect world that would meet all his needs. Man had the ability to fulfill all his desires because he was not opposed by anything. Whatever he accomplished met the standard of the law. He enjoyed all of the things of creation with the highest pleasure and satisfaction. There was nothing stopping him from pleasing God. So when he fell into sin it was like superman taking the Kryptonite. Could you imagine getting anything you wanted and having all of your desires met and then having to face the opposition of everything in yourself and in creation? Is it surprising that brothers took their anger out on each other by murder? Everything they touched came with a warning. You can eat this fruit but it might be contaminated. If you eat too much you will get sick. Before sin you never had a distrustful thought about other people. Now you are angry because they oppose you. So man had to learn self control because he had opposition.