Is this really a stand-alone virtue, or more of a composite of virtues? There’s been a lot written in recent years about “grit”, usually in the context of grade-school education. Might be worth some research.

Complementary virtues

Contrasting vices

TBD

Virtues possibly in tension

TBD

How to acquire or strengthen it

TBD

Notes and links

Mentioned elsewhere

TBD

Inspirational quotes