I swore to never be silent whenever and wherever human beings endure suffering and humiliation. We must always take sides. Neutrality helps the oppressor, never the victim; silence encourages the tormentor, never the tormented.

Elie Wiesel (1928-2016) Romanian-American novelist, professor, political activist, Nobel Laureate.

Nobel Peace Prize acceptance speech (10 Dec 1986)
    (Source)