Prudence means practical common sense, taking the trouble to think out what you are doing and what is likely to come of it...Temperance ...to all pleasures...going the right length and no further...Justice...is...'fairness'; it includes honesty, give and take, truthfulness, keeping promises...And Fortitude includes both kinds of courage - the kind that faces danger as well as the kind that 'sticks it' under pain...But the truth is that right actions done for the wrong reason do not help to build the internal quality or character called a 'virtue'...We might think that God wanted simply obedience to a set of rules: whereas He really wants people of a particular sort.
CS Lewis
Mere Christianity pp 78-80
