It is better to do thine own duty, however lacking in merit, than to do that of another, even though efficiently. It is better to die doing ones own duty, for to do the duty of another is fraught with danger. – Bhagavad Gita
Valor, glory, firmness, skill, generosity, steadiness in battle and ability to rule — these constitute the duty of a soldier. They flow from his own nature. – Bhagavad Gita