ANSWER: If this reasoning is correct, it follows that the devil and his angels had depraved tendencies before they fell into sin, and that they were created with a propensity to sin implanted in them by God. This makes Him the author of sin. If you ask how a perfectly holy soul can sin, we reply that we do not know. How sin got into a holy universe is a question which puzzles all the sages. To give a good reason for sin would justify sin. Sin is unreason. In the Bible the sinner is properly styled a fool. My mind reposes upon a doctrine I cannot explain, that every sinner is the first cause of his own sin, a cause uncaused which no man can explain or comprehend. Every moral intelligences angel, or man is the absolute creator of his own character and destiny.
— from Steele's Answers p. 40.