Wikipedia.Virtue (Latin: virtus, Ancient Greek: ἀρετή "arete") is moral excellence. A virtue is a positive trait or quality deemed to be morally good and thus is valued as a foundation of principle and good moral being. Personal virtues are characteristics valued as promoting collective and individual greatness. The opposite of virtue is vice.
Christians believe there is three thelogical Virtues of Faith, Hope, and Charity/Love and come from the Bible in the book Corinthians.
From Classicial antiquity we get four classic Virtue of Prudence, Temperance, Strength/Fortitude, and Justice.
Plato considered there was a further Cardinal Virtue- Piety
Eastern philosophy has different moral excellences- for example -Respect.
Tarot has clearly 6 Virtue, but there is the on going debate of "Where is Prudence" and depictions of Faith,Hope and Charity, seem to have dissapeared. Or Not.
Then there are some that do not appear in Tarot, but come up in conversation, because of Artworks of Late Medieval or more commonly called Renaissance depictions.
I am starting with Humility...because it appears current.
The symbols of Humility are various- A candle /a Book/Bulrush/Daisies and Violets and in Eastern thought Bamboo.
Monastic groups of Nuns and Monks etc placed high regard and Laws on Humility.
Saint Anthony of Padua thought and said Humility is the highest Virtue- so Christian debate on Virtue is ongoing.The term "humility" comes from the Latin word humilitas, a noun related to the adjective humilis, which may be translated as "humble", but also as "grounded", "from the earth", or "low", since it derives in turns from humus (earth). See the English humus.
Here is a picture called 'Nun reading a book to the congregation of Nuns.' It is actually about Humility.
Profound Silence is the 9th step in Humility practised by some Orders of Nuns. The ninth step can be achieved when one, practicing silence, only speaks when asked a question. I think many members of this Forum pratice this step of Humility
Depicted here is Vallumbrosan Nuns. Their charter is an excercise in Humility. The Nun with the Book -a Saint or a Virtue? Either it seems. Saint Humilitas was a Vallumbrosan Nun.It was an extreme order of the Benedictine persuasion.In fact it was so extreme that Galileo's Father got him away from the Vallumbrosans by subterfuge.
So if Nuns and Mon ks invented tarot the Virtue of Humility would no doubt be represented.