Charity–giving to the poor–is an essential part of Christian morality: in the frightening parable of the sheep and the goats it seems to be the point on which everything turns. Some people nowadays say that charity ought to be unnecessary and that instead of giving to the poor we ought to be producing a society in which there were no poor to give to. They may be quite right in saying that we ought to produce that kind of society. But if anyone thinks that, as a consequence, you can stop giving in the meantime, then he has parted company with all Christian morality. I do not believe one can settle how much we ought to give. I am afraid the only safe rule is to give more than we can spare. In other words, if our expenditure on comforts, luxuries, amusements, etc., is up to the standard of those with the same income as our own, we are are probably giving away too little. If our charities do not pinch or hamper us, I should say they are too small. There ought to be things we should like to do and cannot do because our charitable expenditure excludes them . . . .
Particular cases of distress among your own relatives, friends, neighbors, or employees which God, as it were, forces upon your notice, may demand much more: even to the crippling and endangering of your own position. For many of us the great obstacle to charity lies not in our luxurious living or desire for more money, but in our fear–fear of insecurity. This must often be recognised as temptation.
Mere Christianity pp. 81-82.