Having not practiced E for quite a long time, and when u really use it in real world, then u will feel that what u have learned is not enough any more. But what do u really do in 24 hours per day? Sleeping? Working? Or wandering? I doubt that. But when u really make up mind to pick up a book to study, u r not in the mood to pay attention on it, so that is the real problem here, and maybe that's the human nature: lazy. Ever never say that u will do sth or make sth, then just do it, after it done then tell me what what, people always say“seeing is believing" then just let me see the result.
