Privatio boni
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Privatio Boni can be loosely translated as "lack of good." It is a theological doctrine that good and evil are, in some circumstances at least, asymmetrical. Strictly speaking, it holds that evil is insubstantial, so that thinking of it as an entity is misleading: it would be more constructive to speak only of relative amounts of good.
Our perceptions are based on contrast, so that light and dark, good and evil, are imperceptible without each other; in this context, these sets of opposites show a certain symmetry. But a basic study of optics teaches us that light has a physical presence of its own, whereas darkness does not: no anti-lamp or flashdark can be constructed which casts a beam of darkness onto a surface that is otherwise well-lit. Instead, darkness only appears when sources of light are extinguished or obscured, and only persists when an object absorbs a disproportionate amount of the light that strikes it.
The relationship between light and darkness is often used to frame a metaphorical understanding of good and evil. This metaphor can be used to answer the problem of evil: If evil, like darkness, does not truly exist, but is only a name we give to our perception of privatio boni, then our widespread observation of evil does not preclude the possibility of a benevolent, omniscient, and omnipresent god.
If the metaphor can be extended, and good and evil share the same asymmetry as light and darkness, then evil can have no source, cannot be projected, and, of itself, can offer no resistance to any source of good, no matter how weak or distant. In this case, goodness cannot be actively opposed, and power becomes a consequence of benevolence. However, in this case evil is the default state of the universe, and good exists only through constant effort; any lapse or redirection of good will apparently create evil out of nothing. This idea can be seen at the core of libertarian political philosophy as exemplified by this quote of L. Neil Smith's, "in the midst of a great and terrifying darkness, any little fuzzy-edged pools of light and warmth and love and hope that happen to appear in this horror-filled universe are purely artificial, established where they are, usually at unspeakable cost, by the minds and hands of individual human beings".
