The so-called evils are evils only in relation to a certain thing, and that which is evil in relation to a certain existing thing, either includes the non-existence of that thing or the non-existence of some of its good conditions.
MaimonidesRelated topics
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Temptations come on some people for the cleansing of previous sins, on other for the beautification of their current perfection, and on yet others, as preparation for things to come, except temptations, which are for the increase of a man's faith and virtue, as it was with Job.
Maximus the Confessor