It is difficult, if not impossible, to define the limits which reason should impose on the desire for wealth; for there is no absolute or definite amount of wealth which will satisfy a man. The amount is always relative, that is to say, just so much as will maintain the proportion between what he wants and what he gets; for to measure a man's happiness only by what he gets, and not also by what he expects to get, is as pointless as to try and express a fraction which shall have a numerator but no denominator. A man never feels the loss of things which it never occurs to him to ask for; he is just as happy without them; whilst another, who may have a hundred times as much, feels miserable because he has not got the one thing he wants. In fact, every man has a horizon of his own, and he will expect as much as he thinks it is possible for him to get.