Here Below is the most famous verse of Bhagwat Gita which explains that one should excel in doing his work without keeping the end result in mind. If you do not work with the end result or preset outcome in mind & rather enjoy the way, the process, the path in doing any work, you shall certainly succeed in your work. So it is always better to perform your actions and carry out your duty in an efficient way rather than caring or worrying about the results.
माँ फलेसु कदाचन
माँ कर्म -पहला -हेतुर भुर
माँ ते संगो ’सत्व अकर्मणि
ma phalesu kadachana
ma karma-phala-hetur bhur
ma te sango ’stv akarmani “(Bhagwat Gita: Chapter Two verse 47)”
“Sri Krishna said to Arjuna: You have a right to perform your prescribed duty, but you are not entitled to the fruits of action. Never consider yourself the cause of the results of your activities, and never be attached to not doing your duty.”