Renouncing the Fruits

From the Bhagavad Gita, Chapter 2

47.karmany evadhikaras te
ma phalesu kadacana
ma karma-phala-hetur bhur
ma te sango 'stv akarmani
You have a right to perform your prescribed duty, but you are not entitled to the fruits of action. Never consider yourself to be the cause of the results of your activities, and never be attached to not doing your duty.
48.yoga-sthah kuru karmani
sangam tyaktva dhananjaya
siddhy-asiddhyoh samo bhutva
samatvam yoga ucyate
Be steadfast in yoga, O Arjuna. Perform your duty and abandon all attachment to success or failure. Such evenness of mind is called yoga.
49.durena hy avaram karma
buddhi-yogad dhananjaya
buddhau saranam anviccha
krpanah phala-hetavah
O Dhananjaya, rid yourself of all fruitive activities by devotional service, and surrender fully to that consciousness. Those who want to enjoy the fruits of their work are misers.
50.buddhi-yukto jahatiha
ubhe sukrta-duskrte
tasmad yogaya yujyasva
yogah karmasu kausalam
A man engaged in devotional service rids himself of both good and bad actions even in this life. Therefore strive for yoga, O Arjuna, which is the art of all work.
51.karma-jam buddhi-yukta hi
phalam tyaktva manisinah
janma-bandha-vinirmuktah
padam gacchanty anamayam
The wise, engaged in devotional service, take refuge in the Lord, and free themselves from the cycle of birth and death by renouncing the fruits of action in the material world. In this way they can attain that state beyond all miseries.