Ante-Nicene Fathers Volume 5
Cyprian: Treatise X On Jealousy and Envy
Many people assume that envy and jealousy are only small sins and so not worthy of much attention. And yet, for the Christian every sin is an opportunity for a full-on assault by the devil. We must always be on guard, especially against envy since it very often turns us against each other. It may have even been the first sin, that of the devil when he fell (Cyprian gives an interesting narrative here), and may have been what instigated his temptation of Adam and caused our own fall. It was certainly the cause of much grief after the fall, as Cyprian proves walking through Scripture beginning with Cain. If all this weren't enough, jealousy makes us miserable and takes even the good of others and makes it wretched. In some ways physical damage is easier on us than the hidden wounds of envy. This is why there are so many warnings in the New Testament against it. We must resist envy and pursue instead holiness and the fruit of the Spirit.
This is a truly excellent treatise and ought to be read and profited from!