Nothing is more costly, nothing is more sterile, than vengeance.

Duty and prudence alike command, first, that the germ-centres of hatred and revenge should be constantly and vigilantly surveyed and treated in good time, and, secondly, that an adequate organisation should be set up to make sure that the pestilence can be controlled at its earliest beginnings before it spreads and rages throughout the entire earth.

Before you embark on a journey of revenge, dig two graves.

Now I have taken Hector's revenge!

A small revenge is more human than no revenge at all.

No one accuses without an underlying notion of punishment and revenge, even when he accuses his fate or himself. All complaint is accusation, all self-congratulation is praise.