This is a verse from the most holy book of India, "Bhagvad-Gita" translated to English it would mean the Song of God."Karmanye Waadhikaraste Maa faleshu kadaachana Maa karmaphalheturbhurma te sangostwakarmani "(2..47)Meaning: You have a right to perform the Karma but not to the fruits of action. You have no control over the fruits of action. You should not be desirious of the result and you should not be interested in not doing your Karma.