Illness is a disorder in the order. Because God created man wholesome and perfect. The disorder caused by Satan in the order given by God, has brought with it the illness of the flesh and its consequences, that is, death or sorrowful heredity. Man inherited from Adam and Eve the original sin. But not only that. And, the stain has expanded wider and wider embracing the the three branches of man: the flesh more and more vicious and consequently weak and diseased, the morals prouder and prouder and thus corrupted, the spirit more and more skeptical and thus more and more idolatrous.
In man there are two memories opposed to each other: the memory of the Infinite Good; the memory of the hereditary lustful poison. The first, was left by God for the consolation of man, fallen from his primeval and perfect Grace and Innocence, from that virginity of spirit which, except for Mary, was no longer a dowry among those born of man. The second memory, was left by Satan in the heart of Adam and in those of his descendants, with the assault of the innocent virginity of Adam in Eden.
Baptism annuls the stain but not the incitement. Grace infuses strength to conquer the incitement, but does not annul it. It remains like a secret thorn to irritate the indelible scar of the Fault. Not the wound: the scar. But, if we’re not vigilant, the scar, if irritated and not treated with supernatural means, becomes a wound again.
In every man there are then two opposed forces which fight in him from birth til death and which constitute his test, his victory or his defeat with regard to his supernatural destiny.
You may ask why God leaves this incitement even after the restoration of Grace [in man]? Out of justice. All in God is justice. His every operation is justice and loving justice.
Has not God perhaps left the memory of Himself in the soul created by Him? That memory which is a mysterious source of light which guides to the Light, though sensed in a different way by every living spirit, as is demonstrated by the moral laws of the best [civilizations] and by the more or less vivid gleams of supernatural light in the various revealed religions. Though these latter possess only fragmentary notions, they already teach the existence of a Supreme Being and the duty to live justly in order to possess Him beyond life.
Thus similarly, besides this Infinite Goodness, God leaves [in us] the other memory represented by the thorn of incitement. This keeps our pride at heel. If we felt like we were pure and perfect men, we would become Lucifers, believing that we are equal to God. It keeps our good will vigilant. It makes our love for God heroic. And, through the Father’s compassion, it renders our faults less grave in His eyes. Because if we do not have in ourselves that incitement which agitates and bites our senses and reason with the cunning of the ancient serpent, who generates it, we would not be judged “with mercy”. But much is forgiven us because much in ourselves is aroused not by our pure will, but by the imponderable forces of that incitement — which we do not always succeed in repressing.