Einstein's tribute to Pablo Casals as translated from :Conversations avec Pablo Casals : souvenirs et opinions d'un musicien" (1955).
"The world is a dangerous place to live, not because of the people who are evil, but because of the people who don't do anything about it."
"The world is a dangerous place, not because of those who do evil, but because of those who look on and do nothing."
"The world will not be destroyed by those who do evil, but by those who watch them without doing anything."
via Wikiquote (https://en.wikiquote.org/wiki/Albert_Einstein)