We have ancient habits to deal with, vast structures of power, indescribably complicated problems to solve. But unless we abdicate our humanity altogether and succumb to fear and impotence in the presence of the weapons we have ourselves created, it is as possible and as urgent to put an end to war and violence between nations as it is to put an end to poverty and racial injustice.
The Negro all over the South must come to the point that he can say to his white brother: "We will match your capacity to inflict suffering with our capacity to endure suffering. We will meet your physical force with soul force."
And when this happens, when we allow freedom to ring, when we let it ring from every tenement and every hamlet, from every state and every city, we will be able to speed up that day when all of God's children, black men and white men, Jews and Gentiles, Protestants and Catholics, will be able to join hands and sing in the words of the old Negro spiritual, "Free at last, free at last. Thank God Almighty, we are free at last."
Martin Luther King Jr (1929 - 1968)
Source: Address at March on Washington for Jobs and Freedom (Aug 1963)