You cannot evolve, you cannot become a higher being, if you do not encounter evil in the form of obstacles and ordeals

"The relationship between good and evil is identical to that which exists between spirit and matter. Just as the spirit needs matter in order to express itself, so good needs evil, otherwise it will fall asleep; there is nothing to stimulate it. Evil provokes good, and then good is projected onto the substance of evil as though onto a screen. It’s thanks to evil that good is what it is; without evil we would have no knowledge of good. If humans wish to destroy evil, good will also be destroyed. In some cases, evil can even be said to be the root of good.
Of course, that doesn’t mean we should favour evil; it doesn’t need any favours, it is strong enough as it is. We only need to know it is unavoidable and learn to use it. You cannot evolve, you cannot become a higher being, if you do not encounter evil in the form of obstacles and ordeals. So, be happy that you will always be stimulated, you will always be inspired and full of life, because evil will always be there: there will always be things to annoy you, there will always be flies, wasps, snakes and wicked people, and it is up to you to use them to the good."