Valmiki Ramayana Sundara Kanda Sarga 46 Shloka 14

तथापि तु even then, रणे in a war, जयम् victory, आकाङ्क्षता while desiring, नयज्ञेन by carefully adopting war strategies in an intelligent manner, प्रयत्नेन making effort, आत्मा your own self, रक्ष्यः should be protected, युद्धसिद्धिः victory in war, चञ्चला हि is uncertain.

"Even then, you should safeguard yourself with great effort adopting warstrategies in an intelligent manner to be victorious, for success in war is uncertain.