Thou hast power only to act not over the result thereof. Act thou therefore without prospect of the result and without succcumbing to inaction ( The translation follows thus
Karmani ave adhikars te --you have the power to act only ma phalesu kadachana --you do not have the power to influence the result ma karmaphal hetur bhoo --therefore you must act without the anticipation of the result ma sangostu akramani --without succumbing to inaction )