What is the greatest human virtue? Is is faith? Is it courage?

Greatest as in its most useful from a biological perspective? I would argue that it is persistence.

>>1330904
Definitely a good choice. Other alternative is being an intelligent, but without both it's a very dead end.

>>1330901
Never giving up or quitting.

>>1330933
One might claim that intelligence itself is naught but a resultant of the persistence carried by our genes. Is this not true?

It's prudence. Haven't you read Aristotle? Without prudence you wouldn't have any other virtue.

>>1330901
That some people would do anything to survive and thrive.

It's not morally admirable. However from a practical, realist perspective it is a powerful trait.