Saint Maximilian Kolbe showed great fortitude in standing against Nazism and in giving his life for another.
The notion of fortitude takes a bit of explaining. Like prudence, it seems an old-fashioned word, not used very much in ordinary conversation. When, in fact, was the last time you heard someone use the term? Perhaps the answer is Never. And yet, fortitude is an important concept, and if you possess it as a virtue, you have something very valuable indeed. Why? Because fortitude is about having strength on the level of our deepest self. You might say that fortitude is about being the person you really want to be.
Paradoxically, however, fortitude presupposes human weakness, presupposes that we are liable to be wounded. A stone cannot have fortitude because it has no mind or soul or feelings (as we would understand them). Nor can an angel have fortitude, because an angel is immortal. Fortitude belongs to thinking and feelings beings that are mortal, that can be hurt, and even killed – and that’s us. We can be wounded on so many levels, emotionally, spiritually, physically. Fortitude is that virtue by which we are able to be brave in the face of threats to our emotional, spiritual or physical well-being. Josef Pieper spells it out: ‘...[E]very violation of our inner peace; everything that happens to us or is done with us against our will; everything in any way negative, everything painful and harmful, everything frightening and oppressive’, this is what fortitude is for. And he goes on, ‘The ultimate injury, the deepest injury, is death.’
For further study:
The Catechism of the Catholic Church ,Geoffrey Chapman, London, 1994
The Four Cardinal Virtues, Joseph Pieper, University of Notre Dame Press