iron will

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See: tenacity
References in classic literature ?
Hovering on the verge of the great beyond,--her body "struck" and no longer under control of her iron will,--no divine visions floated across her tired brain; nothing but petty cares and sordid anxieties.
It isn't only the raven-black hair, determined little chin and chic clothes, but a breathless charm coupled with a very adult reserve - iron wills corseted in velvet softness.
Their iron wills of competitiveness mirror that of Howland, and both understand the significance of playing the Gators for the championship.
Log on to any one of the proliferation of pro-anorexia websites and you enter a terrifying world of iron wills and cavernous stomachs, where anorexics and bulimics share tips on successful starvation and where the inspirational mantras include gems such as: "It's better to be thin and dead than fat and living.
ONLY those with stout hearts and iron wills need bother to attend St Andrews tonight in the jousting colours of black and white.