But probably no one thinks now of conscience as a separate faculty, like one of the senses. Indeed, it cannot be so thought of. For an autonomous faculty like a sense cannot be argued with; you cannot argue a man into seeing green if he sees blue. But the conscience can be altered by argument; and if you did not think so, you would not have asked me to come and argue with you about the morality of obeying the civil law when it tells us to serve in the wars. Conscience, then, means the whole man engaged in a particular subject matter.
