【實用書籍app】The Power Of Concentration !|最夯免費app-綠色工廠好玩App

It is of the utmost value to learn how to concentrate. To make the greatest success of anything you must be able to concentrate your entire thought upon the idea you are working on. The person that is able to concentrate utilizes all constructive thoughts and shuts out all destructive ones. The greatest man would accomplish nothing if he lacked concentration.