[Footnote 1: That virtue which springs from knowledge is alone genuine. The painful, hence unactive, emotions of pity and repentance may impel to actions whose accomplishment is better than their omission. Emotion caused by sympathy for others and contrition for one's own guilt, both of which increase present evil by new ones, have only the value of evils of a lesser kind. They are salutary for the irrational man, in so far as the one spurs him on to acts of assistance and the other diminishes his pride. They are harmful to the wise man, or, at least, useless; he is in no need of irrational motives to rational action. Action from insight is alone true morality.] All men endeavor after continuance of existence (III. _prop_. 6); why not all after virtue? If all endeavor after it, why do so few reach the goal? Whence the sadly large number of the irrational, the selfish, the vicious? Whence the evil in the world? Vice is as truly an outcome of "nature" as virtue. Virtue is power, vice is weakness; the former is knowledge, the latter ignorance. Whence the powerless natures? Whence defective knowledge? Whence imperfection in general? The concept of imperfection expresses nothing positive, nothing actual, but merely a defect, an absence of reality. It is nothing but an idea in us, a fiction which arises through the comparison of one thing with another possessing greater reality, or with an abstract generic concept, a pattern, which it seems unable to attain. That concepts of value are not properties of things themselves, but denote only their pleasurable or painful effects on us, is evident from the fact that one and the same thing may be at the same time good, bad, and indifferent: the music which is good for the melancholy man may be bad for the mourner, and neither good nor bad for the deaf. Knowledge of the bad is an abstract, inadequate idea; in God there is no idea of evil. If imperfection and error were something real, it would have to be conceded that God is the author of evil and sin. In reality everything is that which it can be, hence without defect: everything actual is, in itself considered, perfect. Even the fool and the sinner cannot be otherwise than he is; he appears imperfect only when placed beside the wise and the virtuous. Sin is thus only a lesser reality than virtue, evil a lesser good; good and bad, activity and passivity, power and weakness are merely distinctions in degree. But why is not everything absolutely perfect? Why are there lesser degrees of reality? Two answers are given. The first is found only between the lines: the imperfections in the being and action of individual things are grounded in their finitude, particularly in their involution in the chain of causality, in virtue of which they are acted on from without, and are determined in their action not by their own nature only, but also by external causes. Man sins because he is open to impressions from external things, and only superior natures