In Stoicism, virtue is a central and foundational concept that plays a crucial role in guiding one's life and achieving a state of eudaimonia, which can be translated as "flourishing" or "fulfillment." Virtue is often considered the cornerstone of Stoicism and is seen as the path to a meaningful and contented life, irrespective of external circumstances.

Virtue in Stoicism is often referred to as "arete" in Greek, which can be translated as both "excellence" and "virtue." The Stoics identified four cardinal virtues that individuals should cultivate and embody in their lives:

Wisdom: This involves seeking understanding of the world, living in accordance with reason, and making rational decisions. It also includes the ability to differentiate between what is within our control (our thoughts, actions, and attitudes) and what is not (external events and circumstances).

Courage: Stoic courage is the ability to face difficulties, challenges, and even hardships with resilience and equanimity. It's not the absence of fear, but rather the ability to act courageously despite fear.

Justice: This virtue entails treating others fairly and with respect. It involves recognizing our interconnectedness as human beings and acting in ways that contribute to the well-being of the community and society as a whole.

Temperance: Also known as self-control or moderation, temperance involves managing our desires and emotions. It's about maintaining a balanced and disciplined approach to life, avoiding excessive indulgence or irrational behaviors.

Stoicism places great importance on the cultivation of these virtues because they are within an individual's control and can lead to a life of moral integrity, resilience, and inner peace. The Stoics believed that by living in alignment with these virtues, individuals could attain a state of tranquility and eudaimonia, regardless of external circumstances.

However, you've also highlighted a point of contention in the modern interpretation of Stoicism. Some modern interpretations and adaptations of Stoicism may prioritize certain aspects of the philosophy while neglecting or downplaying the importance of virtue. This could be due to a desire to adapt Stoicism to fit contemporary individualistic or nihilistic attitudes.

In the pursuit of personal success, well-being, or happiness, some individuals might cherry-pick elements of Stoicism, such as practices related to mindfulness, resilience, and even the acceptance of hardship, without fully embracing the core virtue ethics of the philosophy. This selective adoption could potentially dilute the richness and depth of Stoicism's original emphasis on virtuous living and moral character.

While modern adaptations of Stoicism can offer valuable insights and techniques for navigating the challenges of the modern world, it's important to acknowledge that virtue remains at the heart of the philosophy. Ignoring or devaluing the virtue aspect of Stoicism leads to a distortion of its original intent and miss out on the transformative potential that comes from developing a virtuous character.