Today’s friend may be tomorrow’s foe.

It is permitted to learn even from an enemy.

With the dead there is no rivalry.

I shall embrace my rival—until I suffocate him.

Opposition may become sweet to a man when he has christened it persecution.

The hatred of relatives is the bitterest.

An injury is much sooner forgotten than an insult.

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

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

Quarrels would not last long if the fault was only on one side.

Better a thousand enemies outside the house than one inside.

Hoping for new friendship from old enemies is / Like expecting to find a rose in a furnace.

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