You can only control your deeds, but you can not have any control or claim over the results.
The fruits of action should not be your motive, and you should never be inactive.
-Lord Krishna (Bhagvad Gita)
This is preaching by Lord Krishna during the Mahabharata war explaining that we should perform our actions and duties without worrying about the results.
Lord Krishna says that without being attached to the fruits of activities , one should act as a matter of duty; for by working without attachment one attains the Supreme.