a.k.a. resilience

Toughness is sometimes seen has having a vice shadow (insensitivity, ill temper, vain masculinity) but it can be an ingredient of endurance/perseverance.

Complementary virtues

Contrasting vices

Virtues possibly in tension

How to acquire or strengthen it

TBD

Notes and links

Mentioned elsewhere

TBD

Inspirational quotes

TBD