On good vs evil, on why Yahovah allows bad things.

When God had formed man as it were His own image, that which was the completion of His workmanship, He breathed wisdom into him alone, so that he might bring all things into subjection to his own authority and government, and make use of all the advantages of the world. And yet He set before him both good and evil things, inasmuch as He gave to him wisdom, the whole nature of which is employed in discerning things evil and good: for no one can choose better things, and know what is good, unless he at the same time knows to reject and avoid the things which are evil. They are both mutually connected with each other, so that, the one being taken away, the other must also be taken away. Therefore, good and evil things being set before it, then at length wisdom discharges its office, and desires the good for usefulness, but rejects the evil for safety.

Therefore, as innumerable good things have been given which it might enjoy, so also have evils, against which it might guard. For if there is no evil, no danger—nothing, in short, which can injure man—all the material of wisdom is taken away, and will be unnecessary for man. For if only good things are placed in sight, what need is there of reflection, of understanding, of knowledge, of reason? since, wherever he shall extend his hand, that is befitting and adapted to nature; so that if any one should wish to place a most exquisite dinner before infants, who as yet have no taste, it is plain that each will desire that to which either impulse, or hunger, or even accident, shall attract them; and whatever they shall take, it will be useful and salutary to them. What injury will it therefore be for them always to remain as they are, and always to be infants and unacquainted with affairs? But if you add a mixture either of bitter things, or things useless, or even poisonous, they are plainly deceived through their ignorance of good and evil, unless wisdom is added to them, by which they may have the rejection of evil things and the choice of good things.

From Lactantius, an early church father from the 3rd-4th century.