Following this simile further, it is quite possible that, just as light waves may travel for millions of years before they reach any object, so thought waves may also travel hundreds of years before they meet an object with which they vibrate in unison. It is quite possible, therefore, that this atmosphere of ours is full of such thought pulsations, both good and evil. Every thought projected from every brain goes on pulsating, as it were, until it meets a fit object that will receive it. Any mind which is open to receive some of these impulses will take them immediately. So, when a man is doing evil actions, he has brought his mind to a certain state of tension and all the waves which correspond to that state of tension, and which may be said to be already in the atmosphere, will struggle to enter into his mind. That is why an evil-doer generally goes on doing more and more evil. His actions become intensified. Such, also will be the case with the doer of good; he will open himself to all the good waves that are in the atmosphere, and his good actions also will become intensified. We run, therefore, a twofold danger in doing evil: first, we open ourselves to all the evil influences surrounding us; secondly, we create evil which affects others, may be hundreds of years hence. In doing evil we injure ourselves and others also. In doing good we do good to ourselves and to others as well; and, like all other forces in man, these forces of good and evil also gather strength from outside.