All that is necessary for evil to succeed is that good men do nothing.
He who does not punish evil, commands it to be done.
~Leonardo da Vinci
When good people in any country cease their vigilance and struggle, then evil men prevail.
~Pearl S. Buck
The world is a dangerous place, not because of those who do evil, but because of those who look on and do nothing.
Be honest in your judgment and do not decide at a glance (superficially and by appearances); but judge fairly and righteously.
I'm a bit partial to GOD and Einstein. But the rest speak volumes as well.