Huh?
It harkens back to Ephesisans 6 doesn’t it?
“Put on the whole armor of God, that you may be able to stand against the wiles of the devil. For we are not contending against flesh and blood, but against the principalities, against the powers, against the world rulers of this present darkness, against the spiritual hosts of wickedness in the heavenly places. Therefore take the whole armor of God, that you may be able to withstand in the evil day, and having done all, to stand.” (verses 12-13).
It also was described in the Roman Catechism that came from the Council of Trent -
**
The Parts of the Church**
These things having been explained, it will be necessary to enumerate the several component parts of the Church, and to point out their difference, in order that the faithful may the better comprehend the nature, properties, gifts, and graces of God’s beloved Church, and by reason of them unceasingly praise the most holy name of God.
The Church consists principally of two parts, the one called the Church triumphant; the other, the Church militant. The Church triumphant is that most glorious and happy assemblage of blessed spirits, and of those who have triumphed over the world, the flesh, and the iniquity of Satan, and are now exempt and safe from the troubles of this life and enjoy everlasting bliss. The Church militant is the society of all the faithful still dwelling on earth. It is called militant, because it wages eternal war with those implacable enemies, the world, the flesh and the devil.
We are not, however, to infer that there are two Churches. The Church triumphant and the Church militant are two constituent parts of one Church; one part going before, and now in the possession of its heavenly country; the other, following every day, until at length, united with our Saviour, it shall repose in endless felicity.
The Members of the Church Militant
****The Church militant is composed of two classes of persons, the good and the bad, both professing the same faith and partaking of the same Sacraments, yet differing in their manner of life and morality.
The good are those who are linked together not only by the profession of the same faith, and the participation of the same Sacraments, but also by the spirit of grace and the bond of charity. Of these St. Paul says: The Lord knoweth who are his. Who they are that compose this class we also may remotely conjecture, but we can by no means pronounce with certainty. Hence Christ the Saviour does not speak of this portion of His Church when He refers us to the Church and commands us to hear and to obey her. As this part of the Church is unknown, how could we ascertain with certainty whose decision to recur to, whose authority to obey?
The Church, therefore, as the Scriptures and the writings of the Saints testify, includes within her fold the good and the bad; and it was in this sense that St. Paul spoke of one body and one spirit. Thus understood, the Church is known and is compared to a city built on a mountain, and visible from every side. As all must yield obedience to her authority, it is necessary that she may*be known by all.
That the Church is composed of the good and the bad we learn from many parables contained in the Gospel. Thus, the kingdom of heaven, that is, the Church militant, is compared to a net cast into the sea, to a field in which tares were sown with the good grain, to a threshing floor on which the grain is mixed up with the chaff, and also to ten virgins, some of whom were wise, and some foolish. And long before, we trace a figure and resemblance of this Church in the ark of Noah, which contained not only clean, but also unclean animals.
But although the Catholic faith uniformly and truly teaches that the good and the bad belong to the Church, yet the same faith declares that the condition of both is very different. The wicked are contained in the Church, as the chaff is mingled with the grain on the threshing floor, or as dead members sometimes remain attached to a living body."
In otherwords…overcoming sin.
Since temptation to sin comes from three sources, the world, the flesh and the devil, then we are at war with all three whenever the temptations arise from these sources.
I don’t think the saints you mentioned would have disagreed at all with this.
The things the saints and folks you mention described are different methods of fighting this war - different aspects of what it means to be in the Church Militant, and various weapons and shields the Church gives us for the battle. Doesn’t sound like they are trying to “define” the concept of Church Militant though…such would have been too narrow given what you posted.
God bless,
Dies Irae