One enemy can do more hurt than ten friends can do good.

Even when called out By a single foe, Remain on guard, For you are always surrounded By a host of enemies

Hector. My word is simple. Arm and face the foe.

never disperse your focus unless absolutely necessary. Face one adversary at a time.

"An Eastern poet, Ali Ben Abu Taleb, writes with sad truth, — "He who has a thousand friends has not a friend to spare,
And he who has one enemy shall meet him everywhere.

You must not fight too often with one enemy, or you will teach him all your art of war.

...For every ten jokes - thou hast got an hundred enemies...

Know thy self, know thy enemy. A thousand battles, a thousand victories.

Know your enemy and know yourself and you can fight a hundred battles without disaster

No matter if the enemy has thousands of men, there is fulfillment in simply standing them off and being determined to cut them all down, starting from one end.

I am not afraid of an opponent who practiced ten thousand kicks once. What I am afraid of is an opponent who practiced one kick, ten thousand times

One fake friend can do more harm than 10 enemies... Be smart choosing your friends.

Ye shall only have foes to be hated; but not foes to be despised: ye must be proud of your foes.

To be honest, as this world goes, is to be one man picked out of ten thousand.