You have to develop your character and earn a good name so that all the noble human qualities will shine forth in you. Your most important duty is to harbor good thoughts, to have good behavior, to speak good words and to lead a good life. You must be very careful with your words and actions so that you will never earn a bad name. Instead of living the life of a crow for a hundred years scavenging off others, it is far better to live a few moments as a swan, with an untainted name and an unblemished character. The Gita extols such a sterling soul whose life is replete with goodness.
Good actions are far more important than physical strength.
A body that is not being used to serve others is nothing but a dead body. Use your body in the service of mankind, not just for the purpose of catering to your own selfish needs. Today, whatever man does, thinks or utters is primarily prompted by selfishness. In order to overcome this tendency, you have to constantly seek opportunities to help others and develop the principle of service. In this process, by your good actions, all of humanity will get sanctified.