It deals with attention, its hindrance and consequences, the cause of error, the condition of doubt, of reservation, of conviction, etc., and general and pure logic is related to it as pure morality, which contains merely the necessary moral laws of a free will in general, is related to the doctrine of virtue proper, which assesses these laws under the hindrances of the feelings, inclinations, and passions to which human beings are more or less subject, and which can never yield a true and proven science, since it requires empirical and psychological principlesb just as much as that applied logic does.