Very simply, by accepting a simple axiom—evil exists solely within you.
If there were no evil in you, then you would have no sensation of evil, and you would not perceive any evil manifestations in the world.
The evil we see in the world is a projection of the evil within us, and we see it on the outside. We think that all kinds of behaviors are evil, and see evil throughout nature, but it is due to evil dwelling within us that we perceive it outside of us. Thus, to rid the world of evil means to correct ourselves. By correcting ourselves, we reach a state where we see only good in the world.
In order to correct ourselves, we require regular learning of the method of correction so that from one day to the next, we increasingly master the method of eradicating evil and approaching good.
In principle, that is mainly what the teaching of Kabbalah entails. That is why the wisdom of Kabbalah has become disclosed in our era on a mass scale: to correct the evil within, to eradicate evil at its root, and by doing so, lead us to sense reality as absolutely good.
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