Gennadius
Heliodorus the Presbyter
Heliodorus the presbyter wrote a book entitled An Introductory Treatise on the Nature of Things. In it he showed that the beginning of things was one; that nothing was coeternal with God; that God was not the creator of evil, but was the creator of all good in such a way that matter, which is used for evil, was created by God after evil was discovered; that nothing material whatever can be regarded as established in any other way than by God; and that there was no other creator than God, who, when by his foreknowledge he knew that nature was to be changed, gave warning of punishment.