It isn't literal. It's a war quote meaning if you put in good and hard effort, it can save your life. In my oppinion, that can relate to more situations and circumstances in life though.
<span>The blindness is considered sudden if the loss of vision develops within a few minutes to a couple of days. It may affect one or both eyes and all or part of a field of vision. </span>Sudden loss of vision can occur for a number of reasons.
The most common causes of sudden loss of vision are physical: damaged retina, Blockage of a major artery of the retina,<span>Eye injury...
</span>But, <span>tests have shown no physical basis for his symptoms. So, the diagnosis can</span> some serious medical conditions such as a stroke or brain tumour.
Answer:
its a potentially life-threatening eating disorder made by vomiting on purpose
Mostly fish or aquatic animals can breath though there skin and or gills.
Hope it helped :)