Only earthbound man still clings to the dark and poisoning superstition that his world is bounded by the nearest hill, his universe ends at river shore, his common humanity is enclosed in the tight circle of those who share his town or his views and the color of his skin.
It is — It is your job, the task of young people in this world, to strip the last remnants of that ancient, cruel belief from the civilization of man.

Day of Affirmation Address (1966)