All that is necessary for the triumph of evil is that good men do nothing.
The only thing necessary for the triumph of evil is for good men to do nothing. It is mis-attributed to Edmund Burke.
There is no record that Burke said this. The quotation became popular after John F. Kennedy began using it in speeches but after careful research by many persons, no source could be found. Bartlett's discontinued attributing the saying to Burke.
It is a great quote though.
* * * Since we are destined to live out our lives in the prison of our minds, our one duty is to furnish it well~Peter Ustinov