The world as we have created it is a process of our thinking. It cannot be changed without changing our thinking. We can not solve our problems with the same level of thinking that created them. Man often becomes what he believes himself to be. If I keep on saying to myself that I cannot do a certain thing, it is possible that I may end by really becoming incapable of doing it. On the contrary, if I have the belief that I can do it, I shall surely acquire the capacity to do it even if I may not have it at the beginning.