Not even a mighty warrior can ...

Not even a mighty warrior can brake a frail arrow when it is multiplied and supported by its fellows. As long as you brothers support one another and render assistance to one another, your enemies can never gain the victory over you. But if you fall away from each other your enemy can brake you like frail arrows, one at a time.
 Genghis Khan

Quotes from the same author

“An action committed in anger is an action doomed to failure.”
 Genghis Khan
Despite all expectations, the time of my last campaign and of my passing is near. I wish to die at home. Let not my end disarm you, and on no account weep for me, lest the enemy be warned of my death.
 Genghis Khan
With Heaven's aid I have conquered for you a huge empire. But my life was too short to achieve the conquest of the world. That task is left for you
 Genghis Khan
Happiness lies in conquering one's enemies, in driving them in front of oneself, in taking their property, in savoring their despair, in outraging their wives and daughters.
 Genghis Khan
The merit in action lies in finishing it to the end.
 Genghis Khan