We are, however, much helped in this necessary work by that very feature of our experience at which we most repine. The invitation to turn our natural loves into Charity is never lacking. It is provided by those frictions and frustrations that meet us in all of them; unmistakable evidence that (natural) love is not going to be "enough"- unmistakable, unless we are blinded by egotism. When we are, we use them absurdly. "If only I had been more fortunate in my children (that boy gets more like his father every day) I could have loved them perfectly." But every child is sometimes infuriating; most children are not infrequently odious. "If only my husband were more considerate, less lazy, less extravagant"..."If only my wife had fewer moods and more sense, and were less extravegant"..."If only my father wasn't so infernally prosy and close-fisted." But in everyone, and of course in ourselves, there is that which requires forbearence, tolerance, forgiveness. The necessity of practising these virtues first sets us, forces us, upon the attempt to turn -more stictly, to let God turn- our love into Charity. These frets and rubs are beneficial. It may be that where there are fewest of them the conversion of natural love is most difficult. When they are plentiful the necessity of rising above it is obvious. To rise above it when it is as fully satisfied and as little impeded as earthly conditions allow -to see that we must rise when all seems so well already- this may require a sublter conversion and a more delicate insight. In this way also it might be hard for the "rich" to enter the kingdom.

-C.S. Lewis (The Four Loves)