Since the fabric of the universe is most perfect and the work of a most wise Creator, nothing at all takes place in the universe in which some rule of maximum or minimum does not appear. . . there is absolutely no doubt that every affect in the universe can be explained satisfactorily from final causes, by the aid of the method of maxima and minima, as it can be from the effective causes themselves. . . Of course, when the effective causes are too obscure, but the final causes are readily ascertained, the problem is commonly solved by the indirect method.
Darkness is a lower energy than light, and when you bring light to the presence of darkness you don't have to warn it, you don't have to tell it that it has to get away. It can't survive. Light dissolves darkness. And so does love dissolve hate and so does joy dissolve sadness and so does faith dissolve doubt and so on.
Yet even the rich have their own kind of suffering, anxiety, doubt, and fear. So in many cases, wealthy people aren't happy! And once those with material wealth encounter small difficulties, their amount of mental suffering is sometimes bigger than it is for those who have faced such difficulties every day.