I pass by the manifold subdivisions of conscience, and only observe what follows from what has just been said, namely, that there is no such thing as an erring conscience. No doubt it is possible sometimes to err in the objective judgement whether something is a duty or not; but I cannot err in the subjective whether I have compared it with my practical (here judicially acting) reason for the purpose of that judgement: for if I erred I would not have exercised practical judgement at all, and in that case there is neither truth nor error. Unconscientiousness is not want of conscience, but the propensity not to heed its judgement. But when a man is conscious of having acted according to his conscience, then, as far as regards guilt or innocence, nothing more can be required of him, only he is bound to enlighten his understanding as to what is duty or not; but when it comes or has come to action, then conscience speaks involuntarily and inevitably. To act conscientiously can, therefore, not be a duty, since otherwise it would be necessary to have a second conscience, in order to be conscious of the act of the first.
The duty here is only to cultivate our con. science, to quicken our attention to the voice of the internal judge, and to use all means to secure obedience to it, and is thus our indirect duty.