By the logic of their position they must just take their impulses as they come, from chance. And Chance here means Nature. It is from heredity, digestion, the weather, and the association of ideas, that the motives of the Conditioners will spring. Their extreme rationalism, by ‘seeing through’ all ‘rational’ motives, leaves them creatures of wholly irrational behaviour. If you will not obey the Tao, or else commit suicide, obedience to impulse (and therefore, in the long run, to mere ‘nature’) is the only course left open.