Whoever attributes to Allah the creation of good, and not the creation of evil, has attributed inability to Allah; had it been like that, this world would have two managers, a manager of good and a manager of evil, and this is blasphemy and shirk. This foolish opinion, from another point of view, makes Allah the Exalted overcome in His Dominion; according to this conviction, Allah the Exalted only Willed the good, so the evil would have taken place by Iblis and his assistant blasphemers despite whatever Allah Willed. Whoever believes in this opinion blasphemes, because of its opposition to the Saying of Allah the Exalted:

وَاللَّهُ غَالِبٌ عَلَى أَمْرِهِ

[which means] “Allah is Dominant over whatever He Created.”  This means no one prevents the fulfillment of His Will.

The judgment of the one who attributes to Allah the good and attributes to the slave the evil out of good manners is that there is no harm on him. However, if he believed that Allah Created the good but not the evil he is charged with blasphemy.

Know, may Allah have Mercy upon you, that if Allah tortured the sinner, that is by His Justice without any injustice; and if He gave reward to the obedient, that is from His Generosity with no obligation upon Him, because injustice is only conceived to occur from someone who has a commander and a prohibitor. Allah has no commander and no prohibitor, so He Does in His dominion as He Willed, because He is the Creator of the things and their Owner.