If all his moves were revocable...

"In a game of chess you can make certain arbitrary concessions to your opponent, which stand to the ordinary rules of the game as miracles stand to the laws of nature. You can deprive yourself of a castle, or allow the other man sometimes to take back a move made inadvertently. But if you conceded everything that at any moment happened to suit him—if all his moves were revocable and if all your pieces disappeared

whenever their position on the board was not to his liking—then you could not have a game at all. So it is with the life of souls in a world: fixed laws, consequences unfolding by causal necessity, the whole natural order, are at once the limits within which their common life is confined and also the sole condition under which any such life is possible. Try to exclude the possibility of suffering which the order of nature and the existence of free-wills involve, and you find that you have excluded life itself."

C S Lewis, 'Problem of Pain' - 1940

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There is a difference between doing some particular just or temperate action and being a just or temperate man. Someone who is not a good tennis player may now and then make a good shot. What you mean by a good player is the man whose eye and muscles and nerves have been so trained by making innumerable good shots that they can now be relied on. They have a certain tone or quality which is there even when he is not playing, just as a mathematician's mind has a certain habit and outlook which is there even when he is not doing mathematics. In the same way a man who perseveres in doing just actions gets in the end a certain quality of character. Now it is that quality rather than the particular actions which we mean when we talk of "virtue."

 (If the bad tennis player hits very hard, not because he sees that a very hard stroke is required, but because he has lost his temper, his stroke might possibly, by luck, help him to win that particular game; but it will not be helping him to become a reliable player.) -- C S Lewis 'Mere Christianity 1952

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Quarrelling means trying to show that the other man is in the wrong. And there would be no sense in trying to do that unless you and he had some sort of agreement as to what Right and Wrong are; just as there would be no sense in saying that a footballer had committed a foul unless there was some agreement about the rules of football. 

If a man asked what was the point of playing football, it would not be much good saying "in order to score goals," for trying to score goals is the game itself, not the reason for the game, and you would really only be saying that football was football-which is true, but not worth saying. -- C S Lewis 'Mere Christianity 1952