What is "virtue" and "vice"?

Have you ever wondered why some people seem to naturally respond with patience when cut off in traffic, while others—perhaps ourselves—immediately feel the surge of anger and the urge to retaliate? Or why certain individuals can walk past a dessert table without a second glance, while others find themselves powerless against temptation? These everyday struggles reveal something profound about the human condition: we are creatures of habit, and these habits shape not just our actions, but who we become.

The ancient philosophers and medieval theologians understood something that modern psychology is only now rediscovering—that excellence in life isn't about isolated good decisions, but about cultivating patterns of behavior so deeply ingrained that they become second nature. This is the realm of virtue and vice, those settled dispositions that make us who we are.

 

Understanding Virtue Through the Lens of Habitus

Thomas Aquinas (13th Centurh), offers us a penetrating analysis of virtue that remains remarkably relevant today. In his Summa Theologiae, Aquinas defines virtue as a "habitus" that disposes us to act well (ST I-II, q. 55, a. 1). But what exactly is a habitus? The Latin term, which Aquinas borrowed from Aristotle's Greek word hexis, doesn't translate perfectly into English. It's more than just a habit in our modern sense—it's not merely something we do repeatedly, like biting our nails or checking our phones.

A habitus is a stable disposition, a kind of "second nature" that we develop through repeated acts. Think of it like a musician's skill. When a pianist first learns to play, every movement requires conscious effort. But after years of practice, the musician's hands move almost automatically, producing beautiful music without conscious thought about each individual movement. The skill has become a habitus, a stable disposition that enables excellent performance.

This understanding immediately corrects a common misconception about virtue. Virtue is not some mysterious substance that God pours into us like water into a glass. It is, rather, a quality of our very being, a way we have shaped ourselves through our choices and actions. As Aquinas explains, virtue is "a good quality of the mind, by which we live righteously, of which no one can make bad use" (ST I-II, q. 55, a. 4).

 

The Biblical Foundation of Virtue as Practice

Scripture consistently presents virtue not as something we passively receive, but as something we actively cultivate. The Apostle Paul writes to the Philippians: "Finally, brothers, whatever is true, whatever is honorable, whatever is just, whatever is pure, whatever is lovely, whatever is commendable, if there is any excellence, if there is anything worthy of praise, think about these things. What you have learned and received and heard and seen in me—practice these things, and the God of peace will be with you" (Philippians 4:8-9, ESV).

Notice the progression Paul outlines: first comes the mental focus ("think about these things"), then comes the practice. The Greek word Paul uses here, prassete, implies continuous action—keep practicing, keep doing. Virtue emerges from this sustained effort.

Similarly, Peter exhorts believers to "make every effort to supplement your faith with virtue, and virtue with knowledge, and knowledge with self-control, and self-control with steadfastness, and steadfastness with godliness" (2 Peter 1:5-6, ESV). This is not passive waiting but active cultivation. The Book of Proverbs repeatedly emphasizes this pattern of habituation: "Train up a child in the way he should go; even when he is old he will not depart from it" (Proverbs 22:6, ESV). Through repeated practice, we create channels in our character through which virtue naturally flows.

 

Vice: The Corruption of Our Natural Capacities

If virtue is a habitus that disposes us toward good action, vice is its mirror opposite—a habitus that disposes us toward evil. Aquinas describes vice as "a habit by whose action is produced an effect contrary to the order of reason" (ST I-II, q. 71, a. 1). Just as virtue becomes second nature through practice, so too does vice embed itself in our character through repeated wrong choices.

Consider how Scripture describes this process. James writes: "Each person is tempted when he is lured and enticed by his own desire. Then desire when it has conceived gives birth to sin, and sin when it is fully grown brings forth death" (James 1:14-15, ESV). Notice the organic metaphor—sin grows, matures, becomes "fully grown." This is the development of vice, the gradual hardening of bad habits into settled dispositions.

Paul describes this same reality in Romans: "Do you not know that if you present yourselves to anyone as obedient slaves, you are slaves of the one whom you obey, either of sin, which leads to death, or of obedience, which leads to righteousness?" (Romans 6:16, ESV). Slavery here represents the bondage of habitus—we become servants to our repeated actions, whether good or evil.

 

The Dynamic Between Virtue and Vice

Here's where Aquinas offers us profound practical wisdom: we don't overcome vice simply by trying not to do bad things. This negative approach—what we might call the "just say no" strategy—rarely succeeds in the long term. Why? Because vice has carved channels in our character, and simply trying to dam up those channels through willpower alone is like trying to stop a river with our bare hands.

Instead, Aquinas teaches that each vice has a corresponding virtue that opposes it. We overcome cowardice not by gritting our teeth and trying not to be afraid, but by cultivating courage. We defeat gluttony not merely by avoiding food, but by developing temperance. We conquer pride not just by thinking less of ourselves, but by cultivating humility.

Augustine captured this principle beautifully when he wrote, "Every vice is the corruption of some natural good" (On the Nature of Good, 3). Our vices are typically good desires that have become disordered. The remedy isn't to eliminate the desire but to order it properly through the cultivation of the opposing virtue.

 

Practical Cultivation: How We Grow in Virtue

So how do we actually cultivate virtue in our daily lives? Aquinas and the broader tradition offer several practical insights:

Start Small and Be Consistent: Aristotle observed that "virtue, then, is a state of character concerned with choice" (Nicomachean Ethics, II.6). Every choice we make either reinforces virtue or vice. Begin with small, manageable acts of virtue. If you struggle with impatience, don't start by trying to be patient in your worst traffic jam. Start by practicing patience in a grocery store line. These small victories build the habitus.

Understand the Interconnection of Virtues: The classical tradition speaks of the "unity of the virtues"—they support and reinforce each other. As you grow in one virtue, you'll find growth in others. Cultivating temperance in eating, for instance, strengthens the will in ways that make courage and patience easier.

Practice Opposite Acts: When fighting a particular vice, deliberately practice acts of the opposite virtue. If you struggle with stinginess, make a practice of regular, planned generosity. If you battle with anger, deliberately perform acts of gentleness and forgiveness. As John Cassian wrote, "It is impossible for us to overcome any vice unless we first plant in ourselves the virtue that is directly opposed to it" (Conference 5.14).

Seek Community: Virtue is not cultivated in isolation. We need others to model virtue for us, to encourage us, and to hold us accountable. Paul understood this when he wrote, "Be imitators of me, as I am of Christ" (1 Corinthians 11:1, ESV). We learn virtue by watching it lived out in others.

Remember Grace Perfects Nature: While virtue is developed through practice, we're not Pelagians who believe we can perfect ourselves through effort alone. Grace doesn't replace our efforts but works through them. As Paul writes, "Work out your own salvation with fear and trembling, for it is God who works in you, both to will and to work for his good pleasure" (Philippians 2:12-13, ESV).

 

Conclusion: The Path to Flourishing

The wisdom of the ancients offers us a hopeful path: we are not prisoners to our worst habits. Our character is not fixed; it is malleable. Every choice—the gentle response to the frustrating driver, the refusal to click on the tempting link, the quiet act of generosity—is a small act of self-sculpture.

By understanding virtue and vice as settled dispositions (habitus) forged by practice, we gain the tools to intentionally shape our second nature. The goal is not merely to perform good deeds, but to become the kind of person for whom acting well is easy, natural, and joyful—a person who is, in the deepest sense, truly flourishing.

Which virtue do you feel is the most challenging to cultivate in your own life, and what small act could you practice this week to begin shaping that habitus?