Saint Paul writes to the Ephesians:
“You [Christ] made alive, when you were dead through the trespasses and sins in which you once walked, following the course of this world, following the prince of the power of the air, the spirit that is now at work in the sons of disobedience. Among these we all once lives in the passions of our flesh.”
This is the most immediate scriptural citation behind the traditional formulation of the three enemies of the soul, The World, the Flesh, and the Devil. This is one of the traditional means of distinguishing between the spirits opposed to God and the Holy Spirit, and by the High Middle Ages, we see this triad quoted by Saint Thomas Aquinas as something widely known and accepted in Catholic moral theology.
Saint Paul says that we once walked in the course of this world, the first enemy. The second, the prince of the power of the air, refers to a belief that demons inhabited the air between earth and heaven, and prevented our ascent there. We see this in icon of the Ladder of Divine Ascent, where monks are attempted to climb to heaven, but are being pulled at, and even at times pulled down by flying demons.
Finally, Paul mentions the passions of the flesh.
In a series of upcoming posts, I will be meditating on these three enemies of the soul: the world, the flesh, and the devil. I will be making use of the thinking of Saint John of the Cross, who does a brief exposition of them in a short work called The Precautions. This is written for cloistered religious, and I plan to follow it pretty carefully, making some suggestions about how we might adapt it to the lay state, and I hope that our later discussion can be an opportunity to flesh out how best to make this adaptation.
In this work, he says that the world is the enemy least difficult to conquer, and so we will happily begin our reflection there. But by way of introduction, I will say a bit more in general about the three enemies.
John of the Cross goes on say that the devil is the hardest to understand, and the flesh is the most tenacious.
In his formulation, we can see that defeating the devil requires purification of the intellect, and battling the flesh the purification of the lower appetites, which leaves the higher appetite of the will as the field of combat against the world.
In traditional monastic spiritual theology, which follows on that of Plato and Aristotle, the soul is divided into three parts. The highest is the rational, and the lowest is called the concupiscible. In the middle is the irascible. If we work our way up, we discover that the concupiscible appetites are those of pleasure and a sort of mindless self-preservation, the interior physical needs of the body. The thoughts connected with this part of the soul are primarily gluttony and lust, though avarice is partly connected to this lower part of the soul.
The middle part of the soul regards our relationships to persons and to good and evil. This irascible part used anger to fend off danger and sadness to remind us of previous mistakes and losses. Under the power of sin, we mistakenly use anger against other persons and sadness against others who we feel deprive us in some way. It culminated in sloth or accedia, a kind of abandonment of any spiritual ideal. This is the area we will be looking in the next post.
Finally, the rational part manifests itself in pride and vainglory.