“A free man is not a slave who has escaped his master; such a man is but a runaway slave who may be caught and returned to servitude. A free man, though he may be overpowered, may be killed, cannot be reduced to servitude; something in him asserts freedom as an inviolable right.It is not negotiable.He does not *ask* that others respect his right, he *requires* it; and it is ultimately his willingness to die for this freedom which forms the basis of his demand that others respect it.”