All 3 Uses

fortitude
in
Death Comes for the Archbishop
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There was certainly nothing in his outer case to suggest the fierceness and fortitude and fire of the man, and yet even the thickblooded Mexican half-breeds knew his quality at once.†
Part 1 *

fortitude = strength of mind that enables one to endure adversity with courage
But he knew his Indians, and that when once they had collectively made up their pueblo mind ...Moreover, he was a proud old Spaniard, and had a certain fortitude lodged in his well-nourished body.†
Part 3
He had, indeed, for years, directed the thoughts of the young priests whom he instructed to the fortitude and devotion of those first missionaries, the Spanish friars; declaring that his own life, when he first came to New Mexico, was one of ease and comfort compared with theirs.†
Part 9

Definitions:

(1) (fortitude)
strength of mind that enables one to endure adversity with courage
(2) (meaning too rare to warrant focus)