How virtues are proved and fortified by their contraries.
From God to Catherine:
“Up to the present, I have taught thee how a man may serve his neighbor, and manifest, by that service, the love which he has towards Me. Now I wish to tell thee further, that a man proves his patience on his neighbor, when he receives injuries from him.
Similarly, he proves his humility on a proud man, his faith on an infidel, his true hope on one who despairs, his justice on the unjust, his kindness on the cruel, his gentleness and benignity on the irascible. Good men produce and prove all their virtues on their neighbor, just as perverse men all their vices; thus, if thou consider well, humility is proved on pride in this way. The humble man extinguishes pride, because a proud man can do no harm to a humble one; neither can the infidelity of a wicked man, who neither loves Me, nor hopes in Me, when brought forth against one who is faithful to Me, do him any harm; his infidelity does not diminish the faith or the hope of him who has conceived his faith and hope through love of Me, it rather fortifies it, and proves it in the love he feels for his neighbor.
For, he sees that the infidel is unfaithful, because he is without hope in Me, and in My servant, because he does not love Me, placing his faith and hope rather in his own sensuality, which is all that he loves. My faithful servant does not leave him because he does not faithfully love Me, or because he does not constantly seek, with hope in Me, for his salvation, inasmuch as he sees clearly the causes of his infidelity and lack of hope. The virtue of faith is proved in these and other ways.
Wherefore, to those who need the proof of it, My servant proves his faith in himself and in his neighbor, and so, justice is not diminished by the wicked man’s injustice, but is rather proved, that is to say, the justice of a just man. Similarly, the virtues of patience, benignity, and kindness manifest themselves in a time of wrath by the same sweet patience in My servants, and envy, vexation, and hatred demonstrate their love, and hunger and desire for the salvation of souls. I say, also, to thee, that, not only is virtue proved in those who render good for evil, but, that many times a good man gives back fiery coals of love, which dispel the hatred and rancor of heart of the angry, and so from hatred often comes benevolence, and that this is by virtue of the love and perfect patience which is in him, who sustains the anger of the wicked, bearing and supporting his defects.
If thou wilt observe the virtues of fortitude and perseverance, these virtues are proved by the long endurance of the injuries and detractions of wicked men, who, whether by injuries or by flattery, constantly endeavor to turn a man aside from following the road and the doctrine of truth. Wherefore, in all these things, the virtue of fortitude conceived within the soul, perseveres with strength, and, in addition proves itself externally upon the neighbor, as I have said to thee; and, if fortitude were not able to make that good proof of itself, being tested by many contrarieties, it would not be a serious virtue founded in truth.”