Giving and receiving must be mutual, which are what hold society together and what make the society and the world we live in have warmth and hope. Although we may not be able to repay kindness to the person who has helped us, as long as we harbor gratitude and thankfulness, and pray for the happiness of our benefactors, or in turn try our best to use what we have, our knowledge and abilities, to help others and contribute to society, that is also repaying kindness.