It is necessary only for the good man to do nothing for evil to triumph.

All that is necessary for the triumph of evil is for good men to do nothing.

One that confounds good and evil is an enemy to good.

The only thing necessary for the triumph of evil is for good men to do nothing

When bad men conspire, good men should associate.

A thing may look specious in theory, and yet be ruinous in practice; a thing may look evil in theory, and yet be in practice excellent.