knowledge and wisdom
Atheists debate that if there were a God then there were be no evil.
In Quran His Almighty God gave some examples that in incomplete knowledge some act seems evil but in fact it has benefit to that it looks done against.
A man put a hole into a ship, which seemed against the ship owners interests but the real cause was that otherwise the ship would be confiscated by a cruel king.
So a believer has to surrender to His Almighty's will knowing that only He that has the perfect knowledge.