But suppose I choose to walk, and someone obstructs me?’ What part of you will they obstruct? Certainly not your power of assent? ‘No, my body.’ Your body, yes – as they might obstruct a rock. ‘Perhaps; but the upshot is, now I’m not allowed to walk.’ Whoever told you, ‘Walking is your irrevocable privilege’? I said only that the will to walk could not be obstructed.