James J. Walsh 
Health Through Will Power [EPUB ebook] 

A French surgeon to whom the remark was made in the third year of the War that France was losing an immense number of men replied: ‘Yes, we are losing enormously, but for every man that we lose we are making two men.’ What he meant, of course, was that the War was bringing out the latent powers of men to such an extent that every one of those who were left now counted for two. The expression is much more than a mere figure of speech. It is quite literally true that a man who has had the profound experience of a war like this becomes capable of doing ever so much more than he could before. He has discovered his own power. He has tapped layers of energy that he did not know he possessed. Above all, he has learned that his will is capable of enabling him to do things that he would have hesitated about and probably thought quite impossible before this revelation of himself to himself had been made.