The Geniality of Love
The natural loves are not self-sufficient. Something else, at first vaguely described as 'decency and common sense', but later revealed as goodness, and finally as the whole Christian life in one particular relation, must come to the help of the mere feeling if the feeling is to be kept sweet.
To say this is not to belittle the natural loves but to indicate where their real glory lies. It is no disparagement to a garden to say that it will not fence and weed itself, nor prune its own fruit trees, nor roll and cut its own lawns. A garden is a good thing but that is not the sort of goodness it has. It will remain a garden, as distinct from a wilderness, only if someone does all these things to it. Its real glory is of quite a different kind. The very fact that it needs constant weeding and pruning bears witness to that glory. It teems with life. It glows with colour and smells like heaven and puts forward at every hour of a summer day beauties which man could never have created and could not even, on his own resources, have imagined. If you want to see the difference between its contribution and the gardener's, put the commonest weed it grows side by side with his hoes, rakes, shears, and packet of weed killer; you have put beauty, energy and fecundity beside dead, sterile things. Just so, our 'decency and common sense' show grey and deathlike beside the geniality of love.
~C.S. Lewis, The Four Loves, "Charity" (1960)