Justice means much more than the sort of thing that goes on in law courts. It is the old name for everything we should now call ‘fairness’; it includes honesty, give and take, truthfulness, keeping promises, and all that side of life. And Fortitude includes both kinds of courage—the kind that faces danger as well as the kind that ‘sticks it’ under pain. ‘Guts’ is perhaps the nearest modern English. You will notice, of course, that you cannot practise any of the other virtues very long without bringing this one into play.
C.S. Lewis, Mere Christianity (1952; Harper Collins 2001) 79.