"Well, dear aunt, it is a thoroughly English, or perhaps I ought to say British, thing, you know.  It isn't mere brute courage.  It will keep a man who has it going steadily on with what he has undertaken.  There is a great deal of self-denial, and perseverance, and steady effort about it.  Persons of high refinement, and of very little physical strength, often show great pluck.  It is by no means mere dash.  There are plucky women too--plucky ladies also as well as plucky men.  Indeed I think that, as a rule, there is more true pluck among the weak than the strong, among the refined than the coarse-grained.  Thus you will find high-bred officers show more pluck and sustained endurance in sieges and fatigue parties than most of the common soldiers; and so it is with travellers through difficult unexplored countries.  Those who have had the least of rough training at home, but have given their mind more thoroughly to the work, will hold out and hold on pluckily when the big fellows with limbs and muscles like giants give in and knock up.  It's pluck that carries them through.  Now, isn't that pretty much the same as moral courage?"