Is my offering a sacrifice?

C.S. Lewis said, “If our expenditure on comforts, luxuries, amusements, etc., is up to the standard common among those with the same income as our own, we are probably giving away too little. If our charities do not at all pinch or hamper us, I should say they are too small. There ought to be things we should like to do and cannot because our charitable expenditure excludes them” (Mere Christianity (1952), 67).