No one wins a quarrel by quarreling.

You shall judge of a man by his foes as well as by his friends.

With the dead there is no rivalry.

We often give our enemies the means for our own destruction.

Enemies are so stimulating.

Rivalry adds so much to the charms of one’s conquests.

Today’s friend may be tomorrow’s foe.

When a coward sees a man he can beat, he becomes hungry for a fight.

Resentment kills a fool, and envy slays the simple.

I tell you, there is such a thing as creative hate!

It is very foolish to attack one’s enemy openly if one can injure him in secret.

Many need no other provocation to enmity than that they find themselves excelled.

Quarreling must lead to disorder, and disorder exhaustion.