How is is possible for evil to exist if God created everything to be good?

If God created all, and all that He created is good, how did evil originate?

The following links should assist you in better understanding the Catholic Church’s teaching on the existence of evil. If you have any further questions or concerns that are not answered by these links, please contact Catholic Answers directly.

Recommended Reading:
God’s love

Can God make square circles?

Why evil?
The origin of evil
Why did God create Satan?
Why does God allow people to be abused?

DISCLAIMER: The views and opinions expressed in these forums do not necessarily reflect those of Catholic Answers. For official apologetics resources please visit www.catholic.com.