While the above explanations answer the question of why evil is a necessary part of the world that God created, the next question may be, ‘Why did God create such a world?’ Could He not have created a world without tests and trials, and where the interest of all creatures align perfectly such as there is no clash that leads to apparent evil? Such a world would mean there would be no platform for humans to improve and to perfect themselves. They would not develop into the more perfect beings that would deserve eternal life in Paradise, in proximity to God. This life is by its nature a life of tests so that we may perfect ourselves and earn our place in Paradise.