Mother, what can I give you?

After having reached the height of his career a man felt a duty to repay his mother back for all that she had done for him.He asked, "Mother, what can I give you? What can I do for you? I sincerely wish to repay you for the sacrifices you made for me and for all the love you have showered upon me."Mother looked surprised and said, "Why do you think about it? It was my duty so I did it, you don't