Everyone all has each others direction and purposein the life. When we onsider our purpose and place in life. Many people all would harbor grand desires to improve and change their respective community and countries. (But i am an exception hehe)).In other words.. success just likes depends on the small tools, or pieces, which keep structures from tumbling. Just as screws are the small yet essential objects that strengthen and sustain, we should strive for the society to live and work within. Without our earnest efforts, communities couldn't be so securely maintained. 

Human society is vast and seems boundless, it also important to be modest. Regardless of how great own achievements maybe, one is still only a single screw in the large machinery. But if you must be a screw, be a strong and shining one!!!