Those men are good who study the good of others without regarding themselves. Those men are ordinary men who, while they benefit others, do not neglect their own interests. Those men are demons who destroy another's good for their own profit. What shall we call those who aimlessly destroy that which is another's?

Everyone has a ‘reservoir of talent'. Intuition, interests and skills form the foundation of talents. These talents are indicators of your calling. The best way to ensure long-term job satisfaction is to act on that calling.