Let us try to imagine what takes place in the soul of a saint at the crucial moment when he makes his first irrevocable decision. Let us consider St. Francis of Assisi when he threw away his raiment and appeared naked before his bishop, out of love for poverty; or St. Benedict Labre when he decided to become a verminous beggar wandering along the roads. At the root of such an act there was something so deep in the soil that it hardly can be expressed, I would say a simple refusal- not a movement of revolt which is temporary, or of despair, which is passive- rather a simple refusal, a total, stable, supremely active refusal to accept things as they are: here it is not a question of knowing whether things and nature and the face of this world are good in their essence- to be sure they are good; being is good insofar as it is being; grace perfects nature and does not destroy it- but these truths have nothing to do with the inner act of rupture, of break, that we are now contemplating. This act is concerned with a fact, an existential fact: Things as they are are not tolerable, positively, definitely not tolerable. In actual existence the world is infected with lies and injustice and wickedness and distress and misery; the creation has been so marred by sin that in the nethermost depths of his soul the saint refuses to accept it as it is. Evil- I mean the power of sin, and the universal suffering it entails, the rot of nothingness that gnaws everywhere- evil is such, that the only thing at hand which can remedy it, and which inebriates the saint with freedom and exultation and love, is to give up everything, the sweetness of the world, and what is better, and what is pleasurable and permissible, in order to be free to be with God; it is to be totally stripped and to give himself totally in order to lay hold of the power of the Cross; it is to die for those he loves. That is a flash of intuition and of will over and above the whole order of human morality.
Once a human soul has been touched by such a burning wing, it becomes a stranger everywhere. It may fall in love with things, it will never rest in them. To redeem creation the saint wages war on the entire fabric of creation, with the bare weapons of truth and love. This war begins in the most hidden recesses of his own soul and the most secret stirrings of his desire: it wil come to an end with the advent of a new earth and a new heaven, when all that is powerful in this world will have been humiliated and all that is despised will have been exalted. The saint is alone in treading the winepress, and of the peoples there is no man with him.
Jacques Maritain, in The Meaning of Contemporary Atheism