Courage is a specialty for soldiers rather than a necessary aspect of every virtue. Moderation is cowardly rather than passionate. Moderation is dull. Justice is a mathematical, impersonal, calculating thing rather than something intuitive like musical harmony. Justice is only external and social.
Justice is necessary but unattractive, like a medicine or a law.
There are many more misunderstandings, of course, but it would take a whole book and the demolition of the foundations of the modern mind to explore them all. That is the one, common in many quarters of modern post-Reformation Christendom, that sees these virtues as a sheer gift of God and not also as hard human work, that sees righteousness as automatically coming with the territory, or part of the package deal of accepting Christ as Lord. It certainly is. But supernatural virtue is not subnatural virtue. It does not dispense with natural human foundations and with our responsibility to be active, not passive, in cultivation of virtuous habits.