No Man's Land by H.C. McNeile — Read

And so, with two of the lessons learned, we come to the third and greatest. The first was basely material, and was taught by Shorty Bill; the second was a little nearer the heart of things, and was taught by the Honourable James; the third is the heart of things, and can be taught by no one. The rules -- vague rules -- may be given by men who have learned it to those who have not; but its true meaning, its real significance, can only be reached by the pupil for himself. And there are many who fall by the way. .

It arises out of the second: it must be preceded by subordination of self. For until a man can subordinate himself, he cannot take on his shoulders the cares of others; he cannot put those others first, And until he can put others before him, he cannot be put in a position of responsibility: he is not fitted to fill it. And it is the principle of responsibility on which the British Army is built up: another thing about which I am very doubtful as to the knowledge of those whose paths have not led them near things military. .