It is common enough for people, when they fall into great disasters, to discern what is right, and what they ought to do; but there are but few who in such extremities have the strength to obey their judgment, either in doing what it approves or avoiding what it condemns; and a good many are so weak as to give way to their habits all the more, and are incapable of using their minds.
 Plutarch, Parallel Lives (c. 100 AD). copy citation

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Author Plutarch
Source Parallel Lives
Topic strength disaster
Date c. 100 AD
Language English
Reference
Note Translated by A. H. Clough
Weblink http://www.gutenberg.org/files/674/674-h/674-h.htm

Context

“Antony, in his flight, was overtaken by distresses of every kind, and the worst of all of them was famine. But it was his character in calamities to be better than at any other time. Antony, in misfortune, was most nearly a virtuous man. It is common enough for people, when they fall into great disasters, to discern what is right, and what they ought to do; but there are but few who in such extremities have the strength to obey their judgment, either in doing what it approves or avoiding what it condemns; and a good many are so weak as to give way to their habits all the more, and are incapable of using their minds. Antony, on this occasion, was a most wonderful example to his soldiers. He, who had just quitted so much luxury and sumptuous living, made no difficulty now of drinking foul water and feeding on wild fruits and roots.” source