In Christian practice, moral truth always coexists with the moral virtues. In a complete Christian life, all the virtues work towards the perfection of human flourishing and, if we consider the theological and infused virtues, beatitudo. On the contrary, Jesus stands at the center of every Christian life. To those who remain united in friendship with him, Christ shows the Way, teaches the Truth, and communicates Life itself. These promises cash out into a life of virtue, which in turn gives the virtuous person a fuller comprehension of what the scriptures teach about the moral life.
Moral virtue forms a good action according to reason in a given circumstance of one's life.
Most immediately reason connotes human intelligence as the principle whereby we measure things, i.e. apprehend them according to a certain ratio. Conversely, when something is spoken of as against reason, one means, not only against the human capacity of that name, but fundamentally against the reason in nature and reality, i.e., the objective order, or reason, in nature which the mind grasps. Three essays in Veritatis Splendor and the Renewal of Moral Theology . Studies by Ten Outstanding Scholars . Pinckaers, Sources , pp.