Jesus Christ is the only complete Realist.
It makes you think, doesn't it? But I came across yet another quote in a longer talk about obedience, namely asking the question "if we obey only for a promise of reward, does that make obedience to the gospel a mercenary affair?" Reward is certainly a better motive to obey than fear...but does it make it mercenary??
I guess it's just like the age-old question: is charity a selfish act -- because we feel good when we help each other, that being our "reward"??
C. S. Lewis says this regarding the natural, consummating reward for obedience to the commandments of God:
"There are different kinds of rewards. There is the reward which has no natural connection with the things you do to earn it and is quite foreign to the desires that ought to accompany those things. Money is not the natural reward of love; that is why we call a man mercenary if he marries a woman for the sake of her money. But marriage is the proper reward for a real love, and he is not mercenary for desiring it. A general who fights well in order to get a peerage is mercenary; a general who fights for victory is not, victory being the proper reward of battle as marriage is the proper reward of love. The proper rewards are not simply tacked on to the activity for which they are given, but are the activity itself in consummation. There is also a third case, which is more complicated. An enjoyment of Greek poetry is certainly a proper, and not a mercenary, reward for learning Greek; but only those who have reached the stage of enjoying Greek poetry can tell from their own experience that this is so. The schoolboy beginning Greek grammar cannot look forward to his adult enjoyment of Sophocles as a lover looks forward to marriage or a general to victory. He has to begin by working for marks, or to escape punishment, or to please his parents, or, at best, in the hope of a future good which he cannot at present imagine or desire. His position, therefore, bears a certain resemblance to that of the mercenary; the reward he is going to get will, in actual fact, be a natural or proper reward, but he will not know that till he has got it. Of course, he gets it gradually; enjoyment creeps in upon the mere drudgery, and nobody could point to a day or an hour when the one ceased and the other began. But it is just insofar as he approaches the reward that he becomes able to desire it for its own sake; indeed, the power of so desiring it is itself a preliminary reward. The Christian, in relation to heaven, is in much the same position as this schoolboy. Those who have attained everlasting life in the vision of God doubtless know very well that it is no mere bribe, but the very consummation of their earthly discipleship; but we who have not yet attained it cannot know this in the same way, and cannot even begin to know it at all except by continuing to obey and finding the first reward of our obedience in our increasing power to desire the ultimate reward. Just in proportion as the desire grows, our fear least it should be a mercenary desire will die away and finally be recognized as an absurdity. But probably this will not, for most of us, happen in a day; poetry replaces grammar, gospel replaces law, longing transforms obedience, as gradually as the tide lifts a grounded ship."