There has to be evil so that good can prove its purity above it. To live a pure unselfish life, one must count nothing as one's own in the midst of abundance.
For, owners of their deeds (karma) are the beings, heirs of their deeds; their deeds are the womb from which they sprang; with their deeds they are bound up; their deeds are their refuge. Whatever deeds they do-good or evil-of such they will be the heirs. And wherever the beings spring into existence, there their deeds will ripen; and wherever their deeds ripen, there they will earn the fruits of those deeds, be it in this life, or be it in the next life, or be it in any other future life.
Overcome your uncertainties and free yourself from dwelling on sorrow. When you delight in existence, you will awaken, and become a guide to those in need, revealing the path to many.