The man who, in danger, in torture, upon the approach of death, preserves his tranquillity unaltered, and suffers no word, no gesture to escape him which does not perfectly accord with the feelings of the most indifferent spectator, necessarily commands a very high degree of admiration.
 Adam Smith, The Theory of Moral Sentiments (1759). copy citation

Context

“has a beauty of its own, and seems to deserve for its own sake a certain degree of esteem and admiration. In the one case, the strength and greatness of the exertion excites some degree of that esteem and admiration. In the other, the uniformity, the equality and unremitting steadiness of that exertion. The man who, in danger, in torture, upon the approach of death, preserves his tranquillity unaltered, and suffers no word, no gesture to escape him which does not perfectly accord with the feelings of the most indifferent spectator, necessarily commands a very high degree of admiration. If he suffers in the cause of liberty and justice, for the sake of humanity and the love of his country, the most tender compassion for his sufferings, the strongest indignation against the injustice of his persecutors, the warmest sympathetic gratitude for his beneficent intentions, the highest sense of his merit, all join and mix themselves with the admiration of his magnanimity, and often inflame that sentiment into the most enthusiastic and rapturous veneration.” source