Mastery was at the heart of the classical ideal of upbringing and education, and a condition for happiness or "the good life" (eudaimonia).

Aretè or virtus cannot be missed and can be describes as:

To know what is essential in a given situation or context.

It's neither a a pure intellectual capacity nore a skill in the general sense of the word.

The knowledge of the master is not the same as the knowledge of the scientist or the expert.

It can be labeled as virtuosity: acting based on or guided by, virtues.

It's an attitude.