The world is the best of all possible worlds, and everything in it is a necessary evil.
A critic is a necessary evil, and criticism is an evil necessity.
Doubtless there are times when controversy becomes a necessary evil. But let us remember that it is an evil.
When you start with a necessary evil, and then over time the necessity passes away, what's left?
It is said that government is a necessary evil, but it is far more evil than it is necessary.
Most "necessary evils" are far more evil than necessary.
Controversy, though always an evil in itself, is sometimes a necessary evil.
As sure as God is good, so surely there is no such thing as necessary evil.
Do not let us mistake necessary evils for good.
Generalities are intellectually necessary evils.
Government is a necessary evil