All natures, because they exist and therefore have their manner and species and a certain peace with themselves, are good; and when they are in the places belonging to the order of nature, they preserve the beingwhich they have received.
The truest cause of the felicity of the good angels is to be found in this, that they adhere to Him Who supremely is; and the cause of the misery of bad angels lies in this, that they have turned away from Him Who supremely is, to themselves, who have not supreme being. This vice has no other name but pride, which is the beginning of every sin. They refused to preserve their strength for Him, and so threw away that in which all their greatness consisted. It is vain to seek for an efficient cause for the bad will; we have to do, not with anything efficient, but with a deficiency. The mere defection from that which supremely is to things which are on a lower grade of being is to begin to have a bad will.
Now God founded mankind, not as the angels, so that even did they sin they should not die; but in such a way that did they obey, they should enter, without death, on a blessed eternity; but, did they disobey, they should suffer the most just penalty, both of body and of soul. For though the human soul is truly said to be immortal, yet is there a sense in which it dies when God forsakes it.
Only because they had begun inwardly to be evil did the first of mankind fall into overt disobedience. A bad will had preceded the bad action, and of that bad will the beginning was pride, or the appetite for an inordinate rank. To lift oneself up is in itself to be cast down and to fall. Wherefore humility is most highly of all things commended in and to the City of God, and in Christ her King; but the contrary vice of arrogance especially rules her adversary, the devil, and this is unquestionably the great difference by which the two cities are divided, and the society of the pious from the society of the impious. Thus two loves have founded two cities, the love of Self extending to contempt of God has made the City of the World; the love of God extending tocontempt of Self has made the Heavenly City.
II.--The Growth of the Cities
This whole universal time or age, in which the dying give way and the newborn succeed them, is the scene and history of those two cities which are our theme. The City of the World, which lasts not for ever, has its good here below, and rejoices in it with such joy as is possible. The objects of its desire are not otherwise than good, and itself is the best of the good things of earth. It desires an earthly peace for lower ends, makes wars to gain this peace, wins glorious victories, and when victory crowns a just cause, who shall not acclaim the wished-for peace? These things are good indeed, and unquestionably are the gifts of God. But if, neglecting the better things, which belong to the supernal city, they covet these lower ends as if there were none higher, misery must inevitably follow.
All men, indeed, desire peace; but while the society which does not live by faith seeks its peace in the temporal advantages of the present life, that which lives by faith awaits the promised blessings, and makes use of earthly and temporal things only as pilgrims do. The earthly city seeks its peace in a harmony of the wills of men with respect to the things of this life. And the heavenly city also, or, rather, that part of it which travels in this mortality, must use that earthly peace while mortality remains. Living a captive life in the midst of the earthly city, it does not hesitate to respect its laws. Since this mortality is common to both cities, there is a concord between them in the things that belong to it. Only, the heavenly city cannot have common laws of religion with the earthly city, but has been forced to dissent, and to suffer hatred and the storms of persecution.
Therefore, this heavenly city, a pilgrim upon earth,calls out citizens from all peoples and collects a pilgrim society of all tongues, careless what differences there may be in manners, laws and institutions by which earthly peace is achieved and maintained, destroying none of these, but rather serving and fulfilling them. Even the celestial city, therefore, uses the earthly peace, and uses it as a means to the heavenly peace; for that alone can be called the peace of a rational creature which consists in a harmonious society devoted to the enjoyment of God and one another in God.
As for that uncertainty with regard to everything, which characterises the New Academy, the City of God detests all such doubting as a form of madness, since she has the most certain knowledge of those things which she understands by mind and reason, however that knowledge may be limited by our corruptible body. She believes also the evidence of the senses, which the mind uses through the body, for he is miserably deceived who regards them as untrustworthy. She believes also the holy Scriptures, which we call canonical.
It is no matter to the City of God what dress the citizen wears, or what manner of life he follows, so long as it is not contrary to the Divine commands; so that she does not compel the philosophers, who become Christians, to change their habit or their means of life, which are no hindrance to religion, but only their false opinions. As for these three kinds of life, the contemplative, the active, and that which partakes of both qualities, although a man living in faith may adopt any of them, and therein reach eternal reward, yet the love of truth and the duties of charity alike must have their place. One may not so give himself to contemplation as to neglect the good of his neighbour, nor be so deeply immersed in action as to neglect the contemplation of God. In leisure we ought to delight, not in an empty inertia, but in the inquisition or discovery of truth, in such a way that each may make progress without envyingthe attainments of another. In action we ought to seek neither the honours of this life nor power, since all that is under the sun is vanity; but only the work itself, which our situation enables us to do, and to do it rightly and serviceably.